Year 9 Geoscience

The crust is divided into a number of large pieces called:

• plates, which move over the convection currents of the magma.

• tectonic plates, which float on the magma of the crust.

• plates, which float on the tectonic convection currents of the mantle.

• tectonic plates, which float on the magma of the mantle.

The Mid-Atlantic Ridge is evidence of:

• plate tectonics.

• sea-floor spreading.

• continental drift.

• convection currents in the mantle.

Plate movement is most likely caused by:

• the plates floating on water.

• sea-floor spreading.

• the plates floating on the semiliquid mantle.

• continental drift.

What is the name of the theory that suggests that the continents once fit together as a giant continent called Pangaea?

• continental drift 

• plate tectonics

• convection currents

• Pangaea

Tsunamis can be caused by:

• earthquakes on land and undersea volcanoes.

• earthquakes and volcanoes on land.

• undersea earthquakes and volcanoes. 

• undersea earthquakes and undersea volcanoes.

A rift valley is typically formed as part of:

• a hot spot.

• a transforming boundary.

• a diverging plate boundary. 

• a converging plate boundary.

If the continents continue to move as they are today, Australia will:

• drift south and become linked with Antarctica.

• drift east and become linked with New Zealand.

• drift west and become linked to Africa.

• drift north and become linked to the rest of Asia. 

The Earth’s tectonic plates move at the rate of:

• a few kilometres per year.

• a few metres per year.

• a few centimetres per year. 

• a few millimetres per year.

The Earth’s crust can also be referred to as:

• its mantle

• the stratosphere

• its outer core

• the lithosphere 

What is the Earth’s crust covered by?

• land and water

• ice

• magma

• land only