Twenty Questions

Earth’s Structure and Geologic Time

Twenty Questions

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1. What is the opening in the Earth from which magma and gas erupt?

2. What is the idea that continents are slowly moving towards and away from each other?

3. Who first presented the evidence for the movement of the continents?

4. What decides the cut off for each geological time unit?

5. What is the outer most layer of the Earth called?

6. What two layers of the Earth make up the lithosphere?

7. Molten rock, that has erupted onto the Earth’s surface is called __.

8. What is the inner most layer of the Earth called?

9. What type of rock is formed from very explosive volcanoes?

10. What is the layer between the crust and the core of the Earth called?

11. This type of magma creates a less explosive volcanic eruption.

12. A volcano that hasn’t erupted in a very long time, but could erupt again is called a ____ volcano.

13. What two layers are responsible for the Earth’s magnetic field?

14. Which geologic time is greater, eon or era?

15. Which geologic time is greater, era or period?

16. Give an example of evidence for continental drift.

17. Give an example for evidence supporting continental drift.

18. Is the crust of the Earth solid, liquid, or both?

19. Is the inner core solid, liquid, or both?

20. Is the mantle solid, liquid, or both?