Unit 2. Social Science.

This is the centre of the geosphere. It is also the hottest layer.

• The mantle

• The crust

• The inner core

• The outer core

This is the thickest layer of the geosphere.

• The crust

• The outer core

• The inner core

• The mantle

This is the top layer of the geosphere. It is thinner than the other layers.

• The mantle

• The inner core

• The outer core

• The crust

These rocks can be formed by volcanic eruptions.

• Igneous

• Metamorphic

• Sedimentary

These rocks are formed by sediments that settle at the bottom of lakes, seas and oceans.

• Sedimentary

• Igneous

• Metamorphic

These rocks are originally sedimentary or igneous rocks.

• Sedimentary

• Igneous

• Metamorphic

These rocks are transformed over time by intense heat and pressure.

• Igneous

• Metamorphic

• Sedimentary

• Volcanic

Marble is a:

• Sedimentary rock

• Igneous rock.

• Metamorphic rock.

Sandstone is a:

• Metamorphic rock.

• Igneous rock.

• Sedimentary rock.

Pumice is a:

• Sedimentary rock

• Igneous rock

• Metamorphic rock