# 3-b Honors Assessment 15.1 Composition Of Seawater

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This assessment will cover the concepts covered in Section 1 of Unit 15

• 1.

• 2.

### The ocean's surface water temperature vaires with the amount of solar radiation received,  which is a direct function of ______________.

• A.

Latitude

• B.

Meredian

• C.

Longitude

A. Latitude
Explanation
The ocean's surface water temperature varies with the amount of solar radiation received, which is a direct function of latitude. Latitude refers to the distance of a location from the equator, and it determines the angle at which sunlight hits the Earth's surface. Areas closer to the equator receive more direct sunlight and therefore have higher surface water temperatures, while areas farther from the equator receive less direct sunlight and have lower surface water temperatures.

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• 3.

### Take a look at this image.   Choose the BEST answer that describes this image.

• A.

The higher the temperature the higher the density

• B.

The lower the temperature the lower the density

• C.

The lower the temperature the higher the density

C. The lower the temperature the higher the density
Explanation
This answer is correct because it states that as the temperature decreases, the density increases. This relationship is commonly observed in many substances, including gases and liquids. When the temperature is lower, the particles in a substance have less kinetic energy and move slower, causing them to be closer together and increasing the density.

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• 4.

### Which of the following is NOT a process that DECREASES the salinity of seawater?

• A.

Runoff from land

• B.

Icebergs melting

• C.

Precipitation

• D.

Evaporation

D. Evaporation
Explanation
Evaporation is not a process that decreases the salinity of seawater because as water evaporates, it leaves behind the dissolved salts, making the remaining water more concentrated and therefore increasing the salinity. Runoff from land, icebergs melting, and precipitation all contribute to decreasing the salinity of seawater by introducing fresh water into the ocean, diluting the salt content.

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• 5.

### What is the salinity of seawater?

• A.

1.5 percent

• B.

3.5 percent

• C.

10 percent

• D.

25 percent

B. 3.5 percent
Explanation
The salinity of seawater refers to the amount of dissolved salts in it. The correct answer is 3.5 percent, which means that for every 1000 grams of seawater, 35 grams are salts. This level of salinity is maintained through a balance of inputs from rivers, precipitation, and outputs through evaporation. It is important to note that the salinity of seawater can vary depending on location and other factors, but on average, it is approximately 3.5 percent.

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• 6.

### In this layer of the ocean between 300 meters and 1000 meters, there is a rapid change of temperature with depth.

• A.

Surface zone

• B.

Thermocline

• C.

Abyssal zone

B. Thermocline
Explanation
The thermocline is the correct answer because it refers to the layer of the ocean where there is a rapid change in temperature with depth. This layer is located between 300 meters and 1000 meters below the surface. The temperature in the thermocline can change significantly over a small vertical distance, creating a distinct boundary between the warmer surface waters and the colder deep waters.

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• 7.

### What units are used to measure the salinity of ocean water?

• A.

Percent

• B.

Parts per billion

• C.

Parts per thousand

• D.

Parts per million

C. Parts per thousand
Explanation
Salinity is a measure of the concentration of dissolved salts in water. It is typically expressed as the number of grams of salt per kilogram of water. Parts per thousand (ppt) is a unit commonly used to measure salinity, indicating the number of grams of salt per thousand grams of water. Therefore, the answer "parts per thousand" is correct as it accurately represents the units used to measure the salinity of ocean water.

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• 8.

### Examine this image.     Sodium is the largest component of sea water

• A.

True

• B.

False

B. False
Explanation
The image provided does not provide any information about the composition of sea water. Therefore, we cannot conclude that sodium is the largest component of sea water based on the given image.

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• 9.

### Most of the salt in seawater is ____________  _________________   or common table salt.

• A.

Potassium chloride

• B.

Magnesium phosphate

• C.

Sodium chloride

• D.

Calcium carbonate

C. Sodium chloride
Explanation
Sodium chloride, also known as common table salt, is the correct answer. This is because sodium chloride is the main component of saltwater or seawater. It is the most abundant salt in the ocean and gives seawater its distinct salty taste.

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• Mar 19, 2023
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• Feb 24, 2012
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