# 7th Grade Science Mid-term Review Quiz

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This is for seventh graders who need to study for their mid term. I got these questions from my teachers study guide.

• 1.

### Where is most of the mass in an atom found?

• A.

The Electron Cloud

• B.

The Nucleus

B. The Nucleus
Explanation
The nucleus is where most of the mass in an atom is found. The nucleus contains protons and neutrons, which have much greater mass compared to electrons. Electrons are located in the electron cloud, which surrounds the nucleus, but they contribute very little to the overall mass of the atom. Therefore, the majority of an atom's mass is concentrated in the nucleus.

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• 2.

### What number is the SI unit based on?

• A.

1

• B.

100

• C.

10

C. 10
Explanation
The SI unit is based on the number 10. The International System of Units (SI) is a globally recognized system of measurement that is used in science, industry, and everyday life. It is based on multiples and submultiples of 10, which makes it a decimal system. This allows for easy conversion between units and simplifies calculations. By using a base of 10, the SI unit system provides a consistent and coherent framework for measuring physical quantities.

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• 3.

### What are solstices, how many times a year do they occur, and what dates are they on?

• A.

The days of the year when daylight and nighttime are the same. Two times. March 20th or 21st and September 22nd or 23rd.

• B.

The shortest days of the year. Three times. June 4th, June 20th, December 22nd.

• C.

The longest days of the year. Three times. February 14th, July 4th, December 25th.

• D.

The shortest and longest days of the year. Two times. June 20th or 21st and December 21st or 22nd.

D. The shortest and longest days of the year. Two times. June 20th or 21st and December 21st or 22nd.
Explanation
Solstices are the shortest and longest days of the year. They occur two times a year, on June 20th or 21st and December 21st or 22nd. During these times, the tilt of the Earth's axis causes the Sun to reach its highest or lowest point in the sky, resulting in the longest or shortest daylight hours.

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• 4.

### What is groundwater and what percentage of the Earth's freshwater is groundwater?

• A.

Water under ground. 89%

• B.

Water found on the ground in parking lots in puddles. 99%

• C.

Water found in the empty spaces + pores on the ground. 14%

• D.

Water that comes from the ground when you somp on it. 2%

C. Water found in the empty spaces + pores on the ground. 14%
Explanation
Groundwater refers to water that is located beneath the Earth's surface, typically in underground aquifers or porous rock formations. It is the water that fills the empty spaces and pores in the ground. The correct answer states that groundwater accounts for 14% of the Earth's freshwater. This means that out of all the freshwater on Earth, 14% is stored underground in these porous spaces and can be accessed through wells and springs.

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• 5.

### What atoms are found in the nucleus?

• A.

The electrons and neutrons.

• B.

The protons and neutrons.

• C.

The protons and electrons.

B. The protons and neutrons.
Explanation
The correct answer is "The protons and neutrons." This is because the nucleus of an atom contains protons, which have a positive charge, and neutrons, which have no charge. Electrons, on the other hand, are found outside the nucleus, orbiting around it in electron shells.

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• 6.

### What are the three main states of matter?

• A.

Solid, liquid, gas

• B.

Solid, plasma, gas

• C.

Liquid, gas, plasma

• D.

Solid, plasma, liquid

A. Solid, liquid, gas
Explanation
The three main states of matter are solid, liquid, and gas. In a solid, the particles are tightly packed together and have a fixed shape and volume. In a liquid, the particles are close together but can move past each other, resulting in a definite volume but no fixed shape. In a gas, the particles are far apart and move freely, resulting in no fixed shape or volume. Plasma is not considered one of the main states of matter as it is a highly ionized gas and only exists at very high temperatures.

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• 7.

### What is a catastrophic event?

• A.

An event that helps the environment and animals around it.

• B.

A widespread destructive event that effects everything in the area.

• C.

What happens at an equinox.

• D.

An event that occurs in certain areas around the world.

B. A widespread destructive event that effects everything in the area.
Explanation
The correct answer is "A widespread destructive event that affects everything in the area." This explanation accurately describes a catastrophic event as an event that causes widespread destruction and impacts all aspects of the affected area. It implies that catastrophic events are not beneficial to the environment or animals, but rather have a detrimental effect.

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• 8.

### What makes up our solar system?

• A.

The sun and the planets

• B.

The sun, earth, moon, and stars

• C.

The sun, planets, comets, meteors, and asteroids

C. The sun, planets, comets, meteors, and asteroids
Explanation
The correct answer is "The sun, planets, comets, meteors, and asteroids." This answer includes all the major components that make up our solar system. The sun is at the center, surrounded by planets, comets, meteors, and asteroids. These objects all orbit the sun and are part of the solar system.

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• 9.

### What is mechanical weathering and the climate it is most prominate in?

• A.

The breaking down of rocks with pHysical processes. Colder.

• B.

The breaking down of rocks through chemicals. Colder.

• C.

The weathering of rocks with other rocks. Warm wet climates

• D.

The breaking down of rocks through chemical processes. Warm wet climates.

A. The breaking down of rocks with pHysical processes. Colder.
Explanation
Mechanical weathering refers to the process of breaking down rocks through physical processes such as frost action, abrasion, and pressure changes. This type of weathering is most prominent in colder climates where freeze-thaw cycles are common. In colder temperatures, water can seep into cracks in rocks, freeze, and expand, causing the rock to break apart. Additionally, the contraction and expansion of rocks due to temperature changes can also contribute to mechanical weathering in colder climates.

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• 10.

### What is the lagest drainage basin in the USA?

• A.

The Nile Rivers basin.

• B.

The Rio Grande basin.

• C.

My bathrooms basin.

• D.

The Mississippi River basin.

D. The Mississippi River basin.
Explanation
The correct answer is the Mississippi River basin. The Mississippi River is one of the longest rivers in the world and drains a large portion of the United States. Its basin covers a vast area, including parts of 31 states and two Canadian provinces. The Mississippi River basin is known for its rich biodiversity and is an important water resource for agriculture, transportation, and recreation.

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• 11.

### What does the rate of weathering depend on?

• A.

The relative location.

• B.

The colour of the rock being weathered.

• C.

The climate.

• D.

If the metal being weathered has been oxidated.

C. The climate.
Explanation
The rate of weathering depends on the climate. Different climates have different temperature and moisture levels, which affect the rate at which rocks break down. In humid and warm climates, weathering tends to be more rapid due to increased chemical reactions and biological activity. In cold and dry climates, weathering may be slower. The climate also influences the type of weathering that occurs, such as freeze-thaw cycles in cold climates or chemical weathering in warm and moist climates. The relative location, color of the rock, and oxidation of metal do not directly affect the rate of weathering.

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• 12.

### Where does soil erosion occur and how can it be slowed?

• A.

Where water flows. Planting vegetation and terracing

• B.

On a farm. Cover the land with a house.

• C.

In a forest. Remove all vegetation.

• D.

In my back yard. Put dog houses every where.

A. Where water flows. Planting vegetation and terracing
Explanation
Soil erosion primarily occurs in areas where water flows, such as rivers, streams, and slopes. Planting vegetation, such as trees and grass, can help slow down soil erosion as the roots of these plants hold the soil together and prevent it from being washed away by water. Terracing, which involves creating levelled platforms on slopes, can also help slow down soil erosion by reducing the speed of water flow and providing a series of steps for the water to move down, minimizing its erosive power.

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• 13.

### What is an esker?

• A.

Like sandblasing. But on a larger scale.

• B.

Ridges on a glacier.

• C.

An old mans moustache.

• D.

Explanation
An esker is a long, winding ridge of sediment that is formed by meltwater streams flowing within or beneath a glacier. As the glacier retreats, the sediment is deposited, creating a ridge-like structure. These ridges can be several kilometers long and are typically composed of sand, gravel, and other glacial debris. Eskers are important geological features that provide valuable information about past glacial activity and can also serve as sources of groundwater.

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• 14.

### What causes earths seasons?

• A.

The tilt on earths axis.

• B.

Its orbit.

• C.

Its rotation.

• D.

Its revolution.

A. The tilt on earths axis.
Explanation
The tilt on Earth's axis causes the Earth's seasons. The Earth's axis is tilted at an angle of about 23.5 degrees relative to its orbit around the sun. As the Earth orbits the sun, different parts of the Earth receive different amounts of sunlight throughout the year. When the Northern Hemisphere is tilted towards the sun, it experiences summer, while the Southern Hemisphere experiences winter. When the Northern Hemisphere is tilted away from the sun, it experiences winter, while the Southern Hemisphere experiences summer. The tilt of the Earth's axis is responsible for the changing angle and intensity of sunlight, which leads to the seasons.

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• 15.

### What attracts all objects toward each other?

• A.

Attraction

• B.

The Ozone layer

• C.

Gravity

• D.

The moon

C. Gravity
Explanation
Gravity is the force that attracts all objects toward each other. It is a fundamental force of nature that exists between any two objects with mass. This force is responsible for keeping planets in orbit around the sun, causing objects to fall towards the Earth, and even holding galaxies together. The moon also exerts a gravitational force on objects, but it is not the sole cause of attraction between all objects.

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• 16.

### What is a lunar eclipse?

• A.

When the moons shadow falls on the Earth.

• B.

When the Earths shadow falls on the Sun.

• C.

When the Suns shadow covers the Earth.

• D.

When the Earths shadow falls on the moon.

D. When the Earths shadow falls on the moon.
Explanation
A lunar eclipse occurs when the Earth's shadow falls on the moon. This happens when the Earth is directly between the sun and the moon, blocking the sunlight from reaching the moon's surface. As a result, the moon appears darkened or reddish in color during a lunar eclipse. This phenomenon can only occur during a full moon when the sun, Earth, and moon are aligned in a straight line.

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• 17.

### What is an equinox, how many times a year do they occur, and what dates do they occur on?

• A.

The days of the year when daylight and nighttime are the same. Two times. March 20th or 21st and September 22nd or 23rd.

• B.

The shortest days of the year. Three times. June 4th, June 20th, December 22nd.

• C.

The longest days of the year. Three times. February 14th, July 4th, December 25th.

• D.

The shortest and longest days of the year. Two times. June 20th or 21st and December 21st or 22nd.

A. The days of the year when daylight and nighttime are the same. Two times. March 20th or 21st and September 22nd or 23rd.
Explanation
An equinox refers to the days of the year when daylight and nighttime are equal in duration. They occur twice a year, specifically on March 20th or 21st and September 22nd or 23rd.

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• 18.

### What is abrasion?

• A.

When water gets into a crack in a rock. When it freezes, it expands. After it melts, the crack is enlarged.

• B.

It is a synonym for striations.

• C.

Like sand blasting on a larger scale against a huge rock wall.

• D.

Ridges that glaciers create as they move through a valley.

C. Like sand blasting on a larger scale against a huge rock wall.
• 19.

### What is plucking?

• A.

When boulders, gravel, and sand are added to the side of a glacier.

• B.

A triangle shaped water basin.

• C.

Ridges made by glaciers passing through valleys.

• D.

Sand blasting on a larger scale.

A. When boulders, gravel, and sand are added to the side of a glacier.
Explanation
Plucking refers to the process in which boulders, gravel, and sand are added to the side of a glacier. As the glacier moves, it exerts pressure on the underlying bedrock, causing it to crack and fracture. The broken pieces of rock are then incorporated into the ice of the glacier and carried along as it continues to move. This process is often observed in areas where glaciers pass through valleys, leaving behind ridges of deposited material. Plucking can also be seen as a form of "sand blasting on a larger scale" as the glacier erodes the landscape and transports the debris it collects.

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• 20.

### How is the modern periodic table organized? (there are two answers)

• A.

AlpHabetically

• B.

By element

• C.

By number of protons

• D.

By atomic number

C. By number of protons
D. By atomic number
Explanation
The atomic number is equal to the number of protons, therefore C and D are the right answers. You will need to know this.

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• 21.

### What is a heterogenous mixture?

• A.

A mixture that is the same throughout and you cannot see all of the "ingredients".

• B.

A mixture that is not the same throughout and you can see all of the "ingredients".

B. A mixture that is not the same throughout and you can see all of the "ingredients".
Explanation
A heterogenous mixture refers to a mixture that is not uniform throughout, meaning that its components are not evenly distributed. In this type of mixture, you can visually identify and distinguish the various ingredients or substances that make it up. This distinguishes it from a homogenous mixture, where the components are evenly distributed and cannot be visually distinguished.

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• 22.

### What is a homogenous mixture?

• A.

A mixture that is the same throughout and you cannot see all of the "ingredients".

• B.

A mixture that is not the same throughout and you can see all of the "ingredients".

A. A mixture that is the same throughout and you cannot see all of the "ingredients".
Explanation
A homogenous mixture refers to a mixture where the components are uniformly distributed and cannot be visually distinguished. In this type of mixture, the "ingredients" are thoroughly mixed and blended together, resulting in a consistent composition throughout. This means that regardless of where you sample the mixture, it will have the same properties and composition. The answer correctly describes a homogenous mixture as being the same throughout and not visually revealing all of its ingredients.

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• 23.

### What is a qualitative observation?

• A.

An observation based on the quality or appearance of something. (like my desk is wooden)

• B.

An observation made with numbers. (like two cats or three dogs)

A. An observation based on the quality or appearance of something. (like my desk is wooden)
Explanation
A qualitative observation refers to an observation that is made based on the quality or appearance of something. It involves using descriptive words or characteristics to describe an object or event, rather than using numerical data. In this case, the example of "my desk is wooden" is a qualitative observation because it describes the quality or appearance of the desk.

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• 24.

### What is unique about the rotation and revolution of Earths moon?

• A.

The rotation occurs every 3 hours and the revolution happens every 7 hours.

• B.

The revolution is elliptical and the rotation is normal

• C.

It happens at the same time

• D.

C. It happens at the same time
Explanation
The unique aspect about the rotation and revolution of Earth's moon is that they happen at the same time. This means that the moon takes the same amount of time to rotate on its axis as it does to complete one orbit around the Earth. This is known as synchronous rotation or tidal locking, and it is why we always see the same side of the moon from Earth.

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• 25.

### What is a renewable resource?

• A.

A resource that cannot be replaced before we use it up.

• B.

A resource that will never run out.

• C.

A resource that can be replaced in time before it runs out.

C. A resource that can be replaced in time before it runs out.
Explanation
The correct answer is "A resource that can be replaced in time before it runs out." This answer correctly defines a renewable resource as one that can be replenished or replaced over time, ensuring that it will not run out or be depleted completely. This definition highlights the sustainability and long-term availability of renewable resources.

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• Current Version
• Mar 21, 2023
Quiz Edited by
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• Jan 09, 2010
Quiz Created by
Super_speller

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