Plate Tectonic Theory

Question 1

In the early 20th century ____ ______ developed theories of ______ ____,

Answer 1

Alfred Wegener, continental drift, indicating that the continents of Earth move and historically were in different positions than they are currently

Question 2

These things led to a theory of plate tectonics.

Answer 2

Seafloor spreading earlier theories of continental drift

Question 3

Convergent boundary

Answer 3

occurs when two plates collide. Volcanoes, mountains, and ocean tranches can form.

Question 4

Divergent boundary

Answer 4

Occurs when two plates move away from one another creating rift valleys in continental material and ridges in ocean basins.

Question 5

Transform boundary

Answer 5

Occurs when two plates move past each other causing faulting and earthquake activity