Layers of the Earth

How old is planet Earth?

• 4.5 million years
• 4.5 billion years
• 4.5 trillion years

How many layers are inside the Earth?

• 2
• 3
• 4
• 5

The outer layer of the earth is the layer we walk on. What is this layer made from?

• oxygen
• rock
• sand
• water

The outer layer of the earth has pieces, much like a jigsaw puzzle. How many pieces are there?

• 7
• 17
• 27
• 37

The layer beneath the surface of the earth is called the mantle. What is this layer made from?

• magma 
• hydrogen
• liquid metal
• water

Beneath the mantle are two layers called the outer core and the inner core. What are these layers made from?

• magma 
• hot gases
• liquid metal
• iron and nickle

How many kilometres is it from the crust of the earth to the inner core?

• about 600 km
• about 6 000 km
• about 60 000 km
• about 600 000 km

How hot is the inner core of the earth?

• about 50 degrees Celsius 
• about 500 degrees Celsius 
• about 5 000 degrees Celsius 
• about 50 000 degrees Celsius