The History of the Earth

What do geologists study? (select two answers)

• Different types of rocks.

• What the Earth is made of.

• The ocean.

• Statues.

Which of these is NOT one of the three important words to remember in geology?

• Time

• Space

• Pressure

• Heat

What is the name of the solid layer of rock that Gerry the geologist finds beneath the layer of red clay?

Which layer of the earth is the thinnest?

• The crust.

• The mantle.

• The inner core.

• The outer core.

Caves in the earth's crust form when...

• Geologists dig them.

• They were always there.

• When water leaks into the crust and erodes rocks away.

• Volcanoes erupt.

The earth's layers in order are: the crust, the mantle, the inner core and the outer core.

• True
• False

The texture of the mantle could be described as...

• All soft and gooey.

• Soft and gooey near the surface, and solid rock near the centre.

• All hard, solid rock.

• Hard, solid rock near the surface, and soft and gooey near the centre.

Why is the inner core made of solid metal?

• Because it is very hot.

• Because of the weight of the earth putting pressure onto it.

• Because it is very cold.

• Because the rocks melt down and become solid again.

Rock that becomes so hot that it melts down into a liquid is called...

Describe in your own words how volcanoes are formed.