2. Earth Layers Test Use the Earth’s layers diagram for the questions 1 to 5.

3. 1. Which Earth layer is marked with the letter “Y”? A. Crust B. Mantle C. Outer Core D. Inner Core

4. 2. Which Earth layer is marked with the letter “X”? A. Crust B. Mantle C. Outer Core D. Inner Core

5. 3. Which Earth layer is marked with the letter “Z”? A. Crust B. Mantle C. Outer Core D. Inner Core

6. 4. What is the composition in the layer marked with the letter “X”? A. Hot, solid iron and some solid nickel B. Hot liquid iron and some liquid nickel C. Cold, brittle rocks and subcontinents D. Hot, semi-solid rocks and molten rocks

7. 5. Which Earth layer contains solid iron? A. Layer W B. Layer X C. Layer Y D. Layer Z

8. 6. How does density and temperature change as you move from crust to the core (as you go deeper)? A. Both temperature and density increase B. Both temperature and density decrease C. Temperature increases and density decreases D. Density increases and temperature decreases

9. 7. Compared to the Earth’s outer core, the mantle is… A. Less dense and hotter B. Less dense and cooler C. More dense and hotter D. More dense and cooler

10. 8. Which of the Earth’s layers is made of liquid iron? A. Crust B. Mantle C. Outer Core D. Inner Core

11. 9. Which of the Earth’s layers is the thinnest layer? A. Crust B. Mantle C. Outer Core D. Inner Core

12. 10. What is the composition of the mantle? A. Brittle hard rocks B. Dense, solid metals C. Dense, semi-solid rocks D. Dense, liquid iron

13. 11. Which statement is true about the Earth layers? A. The Inner Core is made of solid rocks B. The Mantle is hotter than the Outer Core C. The Inner Core is made of liquid iron D. The Outer Core is hotter than the Mantle

14. 12. Which statement best explains how the outer core and the inner core are similar? A. Inner and outer cores are made out of rocks B. Inner and outer cores are made out of plastic C. Inner and outer cores are made out of iron D. Inner and outer cores are made out of lava

15. 13. How do we know what is inside the Earth? A. Fossil evidence B. Global positioning system C. Studying earthquakes D. Studying magnetic reversals

16. 14. Which Earth layers contain iron and nickel? A. Crust and Outer Core B. Mantle and Inner Core C. Crust and Inner Core D. Outer Core and Inner Core

17. 15. Which is the only Earth layer that is all liquid? A. Crust B. Mantle C. Outer Core D. Inner Core

18. 16. From the lowest to the highest pressures, which is the correct order of Earth’s layers? A. Inner core, outer core, mantle, crust B. Mantle, crust, outer core, inner core C. Crust, mantle, outer core, inner core D. Crust, mantle, inner core, outer core

19. 17. Compared to the Earth’s Mantle, the Crust is… A. Less dense and hotter. B. Less dense and cooler. C. More dense and hotter. D. More dense and cooler.

20. 18. Which type of rock is formed when volcanoes erupt, lava flows out, and cools? A. Metamorphic B. Metamorphic and Igneous C. Sedimentary D. Igneous

21. 19. From highest to the lowest temperature, which is the correct order of Earth’s layers? A. Inner core, outer core, mantle, crust B. Mantle, crust, outer core, inner core C. Crust, mantle, outer core, inner core D. Crust, mantle, inner core, outer core

22. 20. Which statement is true about the Inner Core and the Outer Core? A. The Inner Core is liquid and the Outer Core is solid B. The Inner Core is solid and the Outer Core is liquid C. The Inner Core is less dense than the Outer Core D. The Outer Core is hotter than the Inner Core

23. 21. Which statement is true about the Earth layers? A. The Outer Core is made of solid iron B. The Mantle is hotter than the Outer Core C. The Mantle is deeper than the Outer Core D. The Inner Core is denser than the Outer Core

24. 22. What causes the Inner Core to be solid? A. The higher temperatures at the Inner Core causes the materials to become solid B. The temperatures at the Inner Core reverse and change the liquid to solid C. The pressures from all the layers above pushing down on to the Inner Core D. The Inner Core is not solid, it is liquid metal