Movement of Earth's Crust

Process that forms new sea floor along rift

200 million years ago, today's continents used to be one supercontinent. Before that, they -

Sudden movement of rocks in Earth's crust

Earthquake wave that makes the ground roll and sway

Outermost layer of Earth

The temperature inside the core is over 5500ºC, but the core remains solid because-

Forms where two plates move apart

Chain of mountains through the oceans

Mountain that forms around an opening in Earth's crust

Plates grind past each other along it

The large, stiff plates of the lithosphere float on the asthenosphere because of -

Layer that includes crust and upper mantle

Innermost layer of Earth

Which of the following is NOT a reason why Earth's surface is always changing?

Earth's crust moves -

Point in Earth's crust where an earthquake starts

Point on Earth's surface directly above focus

Theory of plate movement

Plates collide along it

The thinnest layer of Earth is the -

Push-pull or back-and-forth wave caused by earthquakes

The Pacific plate is Earth's largest plate. It is named the Pacific plate because -

Scale that measures amount of earthquake energy

Scientist predict that someday San Francisco will be off the coast of Alaska because -

Zone of partially melted rock in upper mantle

Layer directly above the outer core

Plates move away from each other along it

Up-and-down, slower wave in Earth's crust