Earth's Layers & Plate Tectonics

What percentage of Earth's volume does the mantle make up?

• 50%

• 84%

• 25%

• 70%

What is the mantle primarily composed of?

• Silicate rocks rich in magnesium and iron

• Pure iron

• Granite and basalt

• Water and air

What role does the mantle play in plate tectonics?

• It prevents volcanic activity

• It drives plate tectonics through convective movements

• It cools the Earth's core

• It creates ocean currents

What is the role of convection currents in the asthenosphere?

• They create ocean waves

• They drive lithospheric plate movement

• They cause volcanic eruptions

• They influence weather patterns

Which layer of the Earth is the thickest?

• Crust

• Mantle

• Outer Core

• Inner Core

What is the outer core of the Earth made of?

• Solid rock

• Liquid metal

• Dense gas

• Ice

What is the composition of the Earth's inner core?

• Liquid metal

• Dense solid

• Soft rock

• Gaseous layer

Which layer of the Earth is the thinnest?

• Mantle

• Outer Core

• Inner Core

• Crust

What is the innermost layer of the Earth called?

• Outer Core

• Mantle

• Inner Core

• Crust

Which layer of the Earth is the least dense?

• Inner Core

• Outer Core

• Mantle

• Crust