Geology 12

Which layer is known as the "graveyard" of sub ducted oceanic lithosphere?

The D" layer

The speed at which seismic waves travel through Earth's layers depends largely on ___?

The temperature and composition of the material

Thermal energy flows from ___ to ___ regions.

hotter to cooler

If you were to fill a bottle with clay, iron, water, and air, shake its contents, and then let it sit. What would you expect to see from bottom to top?

iron, clay, water, air

The core is ___.

iron-rich and denser than the crust.

Evidence supporting the conclusion that Earth's mantle convects comes from ___.

large super plumes of hot rock rising from the core-mantle boundary

Rotation of Earth on its axis causes its shape to take the form of a ___.

oblate ellipsoid

More than ___ of Earth's vole is contained within the mantle.

80 percent

Which layer of Earth forms at mid-ocean ridges?

Oceanic crust

How do scientists know that Earth's outer core is liquid?

S waves DO NOT pass through the outer core

What happens to seismic waves that pass through the outer core?

S-waves are bent around the outer core.

What is the primary method of heat transfer between the core and the mantle?

conduction

How does heat flow through the outer core?

conduction and convection

The geodynamo is generated by ___.

convection in the outer core.

The Moho separates the ___.

crust and mantle

One-third of Earth's mass comes from ___.

the core.

The positive gravity anomaly in the center of the United States is due to?

thick, dense crustal rocks