Earth's Layers and Plate Techtonics

Front

What is a tectonic boundary where two plates are moving toward each other?

Back

Convergent boundary.

Front

What system determines distance to an object underwater by recording echoes of wave sounds?

Back

Sonar.

Front

What is Earth's outermost and thinnest layer, composed of rock material and is 5-50 km thick?

Back

Crust.

Front

What is the largest layer of Earth, mostly composed of molten material, including the asthenosphere, and is about 2,900 km thick?

Back

Mantle.

Front

What is the relatively thin part of the Earth's crust that underlies the ocean basins, generally younger and denser?

Back

Oceanic crust.

Front

What is the layer of Earth that lies beneath the crust and is primarily composed of silicate minerals?

Back

Mantle.

Front

What type of tectonic boundary occurs when two plates slide past each other?

Back

Transform boundary.

Front

What is the term for the process by which tectonic plates move and interact with one another?

Back

Plate tectonics.

Front

What is the name of the layer of the Earth that is solid and includes the crust and the uppermost part of the mantle?

Back

Lithosphere.

Front

What is the semi-fluid layer beneath the lithosphere that allows tectonic plates to move?

Back

Asthenosphere.