Plate review

Of the following, which layer of Earth is the least dense?

• The mantle
• The ocean crust
• The continental crust
• The asthenosphere

How have scientists reduced what the interior of Earth is like?

• All of these are true
• By analyzing Earthquake waves
• By drilling into the crust, although they didn't get very far
• My analyzing magma and lava from volcanoes

Earth's core gives off heat by way of radioactive decay.

• True
• False

The upper mantle includes the lithosphere and the asthenosphere.

• True
• False

The inner core is solid and the outer core is liquid.

• True
• False

The Earth's core is large for its overall size. Over 1/2 of Earth is thought to be made up of the inner and outer core.

• True
• False

The Earth's core is so large because it was acquired when Protoearth collided with Theia, as they both had metallic cores of their own.

• True
• False

Tags

NGSS.HS-ESS1-6

The most dense layer of Earth is the _____.

• Lithosphere
• Asthenosphere
• Inner Core
• Mantle

Heat (energy) travels through the mantle by way of thermal _______.

• convection
• currents
• conduction
• radiation

Tags

NGSS.MS-PS3-4

Convection currents occur due to ______.

• Density differences in the mantle.
• Heat coming from Earth's radioactive core.
• The flowing of solid rock slowly over millions of years.
• All of these answers are true.