Plate Tectonic Theory

Question 1

In the early 20th century this scientist developed early theories of continental drift, indicating that the continents of Earth move and historically were in different positions than they currently. What is the name of this scientist?

Answer 1

Alfred Wegener

Question 2

In the 1960’s, scientific discoveries about seafloor spreading, combined with earlier theories of continental drift, led to a theory of _____________. (Fill in the blank)

Answer 2

The theory of plate tectonics.

Question 3

According to the theory of plate tectonics, Earths lithosphere is made of plates that move and cause changes in crustal features at _______________. (Fill in the blank)

Answer 3

Plate boundaries

Question 4

What is a convergent boundary?

Answer 4

Occurs when to plates collide and can create volcanos, mountains, and ocean trenches.

Question 5

What is a divergent boundary?

Answer 5

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

Question 6

What is a transform boundary?

Answer 6

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

Question 7

True or False
Mountain ranges, volcanos, rift valleys, and other land features can be observed from space and these images can be used to support theories about tectonic plate activity.

Answer 7

True