EARTH AS A SYSTEM

1. What are the four major spheres of Earth?

• A. Atmosphere, Lithosphere, Geosphere, Hydrosphere 

• B. Hydrosphere, Atmosphere, Geosphere, Biosphere 

• C. Biosphere, Stratosphere, Geosphere, Thermosphere

• D. Troposphere, Cryosphere, Lithosphere, Asthenosphere

2. Which sphere includes all living organisms on Earth?

• A. Biosphere

• B. Geosphere

• C. Hydrosphere

• D. Atmosphere

3. What percentage of Earth's water is found in the oceans? 

• A. 50%

• B. 96%

• C. 75%

• D. 85%

4. Which part of the geosphere includes Earth's crust and the uppermost part of the mantle?

• A. Lithosphere

• B. Asthenosphere

• C. Core

• D. Mesosphere

5. What is the primary component of the continental crust?

• A. Basalt

• B. Granite

• C. Sandstone

• D. Limestone

6.Which layer of Earth is the thickest?

• A. Crust

• B. Mantle

• C. Core

• D. Lithosphere

7. What are the two types of Earth's crust?

• A. Inner crust and outer crust

• B. Continental crust and oceanic crust

• C. Thick crust and thin crust

• D. Upper crust and lower crust

8. Why is the inner core solid despite having a higher temperature than the outer core?

• A. It is composed of stronger materials.

• B. It has more iron than the outer core.

• C. It experiences high pressure that keeps it solid.

• D. It has lower temperatures than the outer core.

9. What is the primary gas in Earth's atmosphere?

• A. Oxygen

• B. Nitrogen

• C. Carbon dioxide

• D. Argon

10.Which layer of Earth contains molten iron and nickel?

A. Inner core

B. Outer core

C. Crust

D. Mantle

• A. Inner core

• B. Outer core

• C. Crust

• D. Mantle