Earth's Structure

___________ is the study of planet Earth, including its composition and structure.

• Geology
• Biology
• Genetics

Scientists who study earth and the processes that have shaped Earth over time are called ________.

• biologists
• genetics
• geologists

Uniformitarianism is the idea that the geologic processes that operate today also operate in the past.

• True
• false

Earth can be divided into four layers. 

• True
• False

The three main layers of the Earth are crust, mantle, and core.

• True
• False

The rocky layer of Earth is the ______.

• Crust
• mantle
• Core

Much of the crust is made up of silicates, rocks made of compounds of silicon and oxygen. 

• true
• False

There are two different crust: Continental and oceanic.

• true
• false

Beneath the crust is the ______, a thick layer of hot but solid rock. 

• core
• mantle
• lithosphere

Three layers of the mantle

• Lithosphere, mesosphere, crust
• Lithosphere, asthenosphere, mesosphere
• Mesosphere, core, oceanic mantle