Question

Which of the following are the layers of the earth?

1. Crust
2. Mantle
3. Core

• A. 1 only
• B. 2 only
• C. None of these
• D. All of these

Answer 1

Answer:

D. All of these

Crust (Outermost layer)

• Thickness: 5-70 km

• Composition: Rocks and minerals

• Temperature: 0-500°C

Mantle

• Thickness: 2,900 km

• Composition: Hot, viscous rock

• Temperature: 500-3000°C

Outer Core

• Thickness: 2,250 km

• Composition: Liquid iron and nickel

• Temperature: 4,000-6,000°C

Inner Core

• Thickness: 1,220 km

• Composition: Solid iron and nickel

• Temperature: 5,000-6,000°C