Plate Tectonics/Continental Drift

___ is composed of oceanic or continental crust and upper mantle. It is hard or rigid.

What hypothesis states that continents slowly moved to their present positions on Earth?

Plates moving in any direction all cause this event:

__ is the large ancient landmass that consisted of all the continents on Earth

What theory states that plates move around on the asthenosphere?

Theory proposed by Harry Hess that includes processes along mid-ocean ridges is ___

___ is the plastic-like layer below the lithosphere.

A plate boundary that moves toward each other and collides or crashes.

Which layer of Earth contains the asthenosphere?

The main problem with Wegener's theory of continental drift was that it lacked ___.

A plate boundary that moves away from each other.

The idea that continents move slowly across Earth's surface is called __.

A plate boundary that moves past each other.

Which term refers to sections of the upper mantle?

____ explains locations of mountains, trenches, and volcanoes

The same exact fossils were found on 2 continents separated by water. How can we explain this?

The mechanism that drives Continental Drift is ___.

How did rock/mountain clues support Wegener's theory of Continental Drift?

Who developed the continental drift hypothesis?

What historic event in the 1940's brought sonar radar and understanding of seafloor spreading?

What type of plate boundary is the San Andreas Fault part of?

____ is evidence that many continents were at one time near Earth's south pole.

Where do Earth's plates slide past each other?

About how fast do plates move each year?