Structure of the Earth

What are the main layers that make up the Earth's structure?

• Crust, Mantle, Core

• Atmosphere, Hydrosphere, Lithosphere

• Outer layer, Middle layer, Inner layer

• Soil, Rock, Lava

What is the approximate thickness of the Earth's crust on land?

• About 50 miles

• About 150 miles

• About 25 miles

• About 1800 miles

What percentage of Earth's total mass does the mantle account for?

• Less than 1%

• About 50%

• About 85%

• About 100%

What is the Earth's outer core primarily made of?

• Solid rock

• Liquid molten lava

• Soil and water

• Hard, rigid rock

What is the approximate temperature of the Earth's inner core compared to the Sun?

• It is much colder than the Sun's surface.

• It is as hot as the Sun's surface.

• It is slightly warmer than the Earth's surface.

• It is cooler than the outer core.