7.1-Earth's Interior - 3

What does the mantle refer to?

• The molten outer core

• The hot solid layer beneath the Earth's crust

• The atmosphere of the Earth

• The rocky mountains

Approximately how thick is the mantle?

• 3 kilometers

• 30 kilometers

• 300 kilometers

• 3,000 kilometers

What is the uppermost part of the mantle and crust collectively called?

• Core

• Asthenosphere

• Lithosphere

• Mesosphere

What is the lower part of the mantle referred to as?

• Lithosphere

• Asthenosphere

• Mantle core

• Mesosphere

How would you describe the composition of the uppermost part of the mantle?

• Less rigid and less hard

• Soft and easily bendable

• Strong, hard, and rigid

• Molten and fluid-like

How would you describe the composition of the lower part of the mantle?

• Strong, hard, and rigid

• Extremely cold and solid

• Less strong, less hard, and less rigid, but very hot and bendable

• Consisting of molten metals

What is convection?

• The movement of tectonic plates

• The transfer of heat and energy through solids

• The transfer of heat and energy through liquids or gases

• The process of volcanic eruption

What drives convectional currents in Earth's mantle?

• Wind and rain

• Heat and gravity

• Plate tectonics

• Earth's magnetic field

Approximately how long does it take for one convectional current cycle in the mantle to complete?

• Thousands of years

• Hundreds of years

• Millions of years

• Billions of years