The Earth and its Atmosphere

Which layer of the Earth is rocky and between 8km and 40km thick?

• inner core

• outer core

• mantle

• crust

Which layer of the Earth is below the crust?

• mantle

• inner core

• outer core

• atmosphere

What is special about the solid rock of the core?

• it is brown

• it can flow

• it is liquid

• it is mostly made of oxygen

What do we call the inside layer of the Earth?

• atmosphere

• crust

• mantle

• core

What is the core mainly made of?

• iron and gold

• nickel and platinum

• nickel and iron

• earth and fire

What state is the core of the Earth?

• solid

• liquid

• gas

• plasma

How do scientists learn about the structure of the Earth? (Tick all that apply.)

• by thinking really hard

• by examining rocks

• by making stuff up

• by studying shock waves from earthquakes

What is the most common element in the Earth's crust?

• silicon

• iron

• oxygen

• aluminium

What is the percentage of nitrogen in Earth's atmosphere?

• 78%

• 21%

• 0.17%

• 0.03%

What is the percentage of oxygen in Earth's atmosphere?

• 78%

• 21%

• 0.17%

• 0.03%