Help 40 points!!!

20. What is so important about subduction of tectonic plates?
1 point
- Earth's crust is melted and destroyed here
- Earth's new crust is created here
- Earth's mountains are formed here
- Earth's crust becomes a mid-ocean ridge here

17. Where might we find the oldest rock on Earth?
1 point
- the center of continents, called cratons
- the center of the ocean floor
- the lowest mountain on Earth
- pushed under a tectonic plate

21. Based on plate movement over a Hot Spot, which of the Hawaiian Islands below would be the oldest?
- Loihi
- Hawaii
- Maui
- Oahu
- Kauai

22. In 1915, the German geologist and meteorologist Alfred Wegener first proposed the theory of continental drift, which states that parts of the Earth's crust slowly drift atop a liquid core. The fossil record supports and gives credibility to the theories of continental drift and plate tectonics. Why was the continental drift theory rejected at the time of its proposal?
1 point
- It did not explain the mechanism causing the formation of continents.
- It did not explain the mechanism behind the existence of continents.
- It did not explain the mechanism behind the discovery of continents.
- It did not explain the mechanism causing the movement of continents.