Earth Science Quiz

What percentage of the Earth's mass does the crust make up?

• Less than 1%

• About 10%

• About 25%

• More than 50%

The Earth's inner core is made of:

• Molten rock

• Solid iron and nickel

• Liquid metal

• Compressed gas

The mantle is primarily composed of:

• Solid rock

• Liquid water

• Superheated metal and rock

• Gas and plasma

How thick is the Earth's mantle?

• 750 miles

• 1,800 miles

• 3,500 miles

• 4 miles

What causes convection currents in the mantle?

• Rotation of the Earth

• Magnetic fields

• Temperature differences

• Gravity

Tectonic plates are:

• Sheets of molten rock

• Sheets of solid rock in the crust

• Layers of the mantle

• Parts of the inner core

What keeps tectonic plates from moving continuously?

• Gravity

• Magnetism

• Friction

• Convection currents

Earthquakes are triggered when:

• The inner core rotates

• The mantle stops convecting

• Tectonic plates collide

• The crust melts

The crust compared to the size of the Earth is like:

• The skin of an orange

• The peel of an apple

• The shell of an egg

• The rind of a watermelon

The temperature in the mantle can reach up to:

• 1000°C

• 2000°C

• 3500°C

• 5000°C