Layers Of The Earth (Grade 6)

1. What do you call the movement of the slabs of land which may cause earthquakes or volcanic eruptions?

Plate Tectonics

Plate in Motion

Uniformitarianism

Platonic Earth

Plate = slabs of land
Tectonics = movement or processes that change the Earth's crust

Explanation

Plate = slabs of land
Tectonics = movement or processes that change the Earth's crust

2. Most of the weight of the Earth is found in the thickest layer, about 2,900 km thick. Which is it?

Mantle

Inner Core

Outer Core

Mohorovicic Discontinuity

The mantle is the correct answer because it is the thickest layer of the Earth, approximately 2,900 km thick. The mantle is located between the Earth's crust and the core. It is composed of solid rock that is capable of flowing over long periods of time, similar to the consistency of hot tar. The mantle makes up about 84% of the Earth's total volume and contains a significant portion of the Earth's mass, hence most of the weight of the Earth is found in the mantle.

Explanation

The mantle is the correct answer because it is the thickest layer of the Earth, approximately 2,900 km thick. The mantle is located between the Earth's crust and the core. It is composed of solid rock that is capable of flowing over long periods of time, similar to the consistency of hot tar. The mantle makes up about 84% of the Earth's total volume and contains a significant portion of the Earth's mass, hence most of the weight of the Earth is found in the mantle.

3. This part of the crust makes up the mountains, hills, volcanoes, plains or valleys.

Oceanic Crust

Continental Crust

Asthenosphere

Lithosphere

The correct answer is Continental Crust. Continental crust refers to the part of the Earth's crust that is found beneath the continents. It is thicker and less dense compared to oceanic crust. This part of the crust is responsible for the formation of mountains, hills, volcanoes, plains, and valleys on the Earth's surface. It is composed of various types of rocks, including granite and sedimentary rocks. Continental crust plays a crucial role in shaping the Earth's landscape and providing habitats for various organisms.

Explanation

The correct answer is Continental Crust. Continental crust refers to the part of the Earth's crust that is found beneath the continents. It is thicker and less dense compared to oceanic crust. This part of the crust is responsible for the formation of mountains, hills, volcanoes, plains, and valleys on the Earth's surface. It is composed of various types of rocks, including granite and sedimentary rocks. Continental crust plays a crucial role in shaping the Earth's landscape and providing habitats for various organisms.

4. Which layer of the Earth is made up of solid iron and nickel?

Crust

Asthenosphere

Outer Core

Inner Core

The core holds the greatest pressure among the layers; that's why, all of its materials are solidly compact together.

Explanation

The core holds the greatest pressure among the layers; that's why, all of its materials are solidly compact together.

5. We know that the inside or centermost part of the Earth is solid. Why?

Constant Rotation of the Earth

High build-up of pressure

The material it is made up of

Too much heat

The pressure is towards the center, creating the ball-like core of the Earth. This means the energy is compressed in the center of the Earth where gravity is located.

Explanation

The pressure is towards the center, creating the ball-like core of the Earth. This means the energy is compressed in the center of the Earth where gravity is located.

6. This holds the continents and oceans together.

Asthenosphere

Lower Mantle

Upper Mantle

Lithosphere

The lithosphere is the correct answer because it is the rigid outer layer of the Earth that includes the crust and a portion of the upper mantle. It is divided into several large tectonic plates that float on the semi-fluid asthenosphere below. These plates are constantly moving and interacting with each other, which helps to hold the continents and oceans together. The lithosphere is responsible for the formation of mountains, earthquakes, and the creation of oceanic and continental features.

Explanation

The lithosphere is the correct answer because it is the rigid outer layer of the Earth that includes the crust and a portion of the upper mantle. It is divided into several large tectonic plates that float on the semi-fluid asthenosphere below. These plates are constantly moving and interacting with each other, which helps to hold the continents and oceans together. The lithosphere is responsible for the formation of mountains, earthquakes, and the creation of oceanic and continental features.