Need a Hint?
1.What evidence proved that South America, Africa, India, and Australia were once covered by glaciers? glacial deposits and rock surfaces scarred by glaciers
2. What happens when an oceanic plate converges with a continental plate?
The denser oceanic plate slides under the less dense continental plate.
3. A divergent boundary is a boundary between two plates that __________.
Move away from each other.
4.Do two colliding continental plates always cause volcanoes?
Two colliding continental plates do not always cause volcanoes
5. What clue supported the continental drift theory?
The puzzlelike fit of all the continents fossils of Mesosaurus, and similar rock structures on …show more content…
8.Why was the discovery of no rocks older than 2 billion years old on the ocean floor so important?
The discovery of no rocks older that 2 billion years old on the ocean floor proved the theory of seafloor spreading.
9. How do scientists explain the formation of underwater mountain ranges?
Scientists believe seafloor spreading explains the formation of underwater mountain ranges.
10. How do scientists use sound waves to figure out the shape of the ocean floor?
Scientists use sound waves to figure out the shape of the ocean floor because sound waves echo off the ocean floor - the longer it takes a sound wave to return to the ship, the deeper the water is.
11.How can crust disappear at the edge of a boundary?
Crust can disappear at the edge of a boundary when new crust is being added to the other edge of the boundary.
12. What is the difference between normal faults and rift valleys?
The difference between normal faults and rift valleys is that rift valleys are formed from normal faults.
13. Who first proposed the theory of continental drift?
Alfred Wegener first proposed the theory of continental