Planet Earth #4

The 3 rock classes are...

• Small, medium and large

• Igneous, sedimentary and quartz

• Igneous, lustre, metamorphic

• Metamorphic, igneous and sedimentary

If a mineral splits easily into two smooth surfaces, this can be described as...

• Fracture

• Cleavage

• Spiral break

• Streak

If a mineral breaks into rough, uneven surfaces, this can be described as...

• Streak

• Fracture

• Cleavage

• Destruction

This class of rock is created from lava or magma

• Metamorphic

• Sedimentary

• Stone

• Igneous

This class of rock forms when small pieces of rock are carried by water or wind and settle or sink down onto the rocks below them. Sometimes these pieces are made up mainly of tiny shells from dead animals.

• Sedimentary

• Igneous

• Basalt

• Metamorphic

This class of rocks has been changed. Its name comes from a combination of two Greek words: “meta” means change, and “morph” means form.

• Sedimentary

• Metamorphic

• Igneous

• Sandstone

Can rocks change their class over time? For example, can an igneous rock become a sedimentary rock? Please explain using full sentences (3 points).

Soil is mainly composed of two materials...

• Rock & Water

• Decaying organic matter & rock

• Fossils & Liquids

• Decaying organic matter & plants

Colour is a useful starting point when identifying rocks because it is often the first property you notice.

• True

• False

A mineral’s streak is the colour of the powder that it leaves behind when you rub it across a rough surface. The colour of the streak is not always the same as the colour of the mineral.

• True

• False