The layers of the Earth are...

• Core, mantle and orogeny.

• Orogeny, relief, core, mantle and crust.

• Crust, mantle, outer core and inner core.

• Crust, outer mantle, inner mantle and core.

What is orogeny?

• Geological hazards as volcanoes and earthquakes.

• High temperatures and pressures from the Earth's interior.

• Wind, water and human action that shapes the relief.

• Tectonic plates that create volcanoes and mountains.

What are faults?

• When orogeny deforms flexible rocks and creates mountains.

• When orogeny breaks hard rocks and sometimes creates earthquakes.

What is a glacier?

• The action of water on permeable rock that create canyons.

• Rivers of water that erode rock and create V-shaped valleys.

• Waves eroding the coastline to produce cliffs and beaches.

• Bodies of ice that erode rock and create U-shaped valleys.

What are ocean trenches?

• Submarine depressions where tectonic plates meet.

• An area of the ocean floor that is about 4,000 m deep.

• Submarine volcanos near the Hawaiian coast.

• Mountains of volcanic origin where tectonic plates meet.

In an earthquake the place where the seismic waves are produced is called...

• ...epicentre.

• ...megacentre.

• ...hypocentre or focus.

• ...Richter centre.

Seismic waves at sea produce...

• ...underwater volcanoes.

• ...tsunamis.

• ..hypocentres on the Earth's crust.

• ...minor damage.

The agents that shape the relief are...

• ...water, earth, humans, oceans and temperatures.

• ...earthquakes, wind, humans, tsunamis and temperatures.

• ...water, wind, humans, orogeny and temperatures.

• ...water, volcanoes, humans, layers of the earth and temperatures.

Tectonic plates are large blocks...

• ...that collide and separate a lot of times every year.

• ...that separate from each other some metres every year.

• ...that move over the Mantle slowly and continually.

• ...that move over the magma of the external core.

Water shapes relief...

• ...by high temperatures to form deserts and plains.

• ...by making rock explode and eroding mountains.

• ...by eroding rocks and forming valleys, beaches and cliffs.

• ...by colliding against the tectonic plates.