Plate Tectonics

Alfred Wegner came up with the concept of.....

What is one reason oceanic crust subducts?

Plates slip past each other at this type of boundary

Continental drift states that all landmasses were once _________ and have since __________apart

This device is used by geologists to map the ocean floor.

All the continents were once together in a land form called?

At divergent boundaries plates....

This forms where pieces of Earth diverge on land.

I can explain Wegner's idea of continental drift?

A(n)_______ is any trace of an ancient organism preserved in rock.

This is the last name of the scientist that thought of sea-floor spreading.

The grade that I will get on this test is

Mountains form at this type of boundary.

Subduction occurs at....

I can name 3 pieces of evidence that geologists have used to support sea-floor spreading.

This occurs at mid-ocean ridges?

The three pieces of evidence to support continental drift are

These often form when oceanic and continental crust collide.

Breaks in Earth's crust where rocks have slipped past each other are called

The three pieces of evidence to support sea-floor spreading are