Rocks Quiz

1 Some rocks are permeable because:

• the rock dissolves in water.

• water can get into gaps between the grains.

• animals have dug burrows in the rock.

• the rock is made of interlocking crystals.

Igneous rocks are formed when:

• magma or lava is put under pressure.

• magma or lava cools down.

• magma or lava is heated up.

• magma or lava evaporates

When an igneous rock is forming:

• large crystals will form if the magma heats up quickly.

• small crystals will form if the magma cools slowly.

• large crystals will form if the magma cools slowly.

• small crystals will form if the magma evaporates quickly.

Metamorphic rocks are formed by the effects of:

• high pressures or low temperatures

• high pressures or high temperatures

• low pressures or high temperatures

• low pressures or low temperatures

Physical weathering happens to rocks when:

• the weather is always hot

• the weather keeps changing between hot and cold

• the weather is always cold

• the rock gets struck by lightning

Freeze–thaw action damages rocks because:

• the rocks melt

• the rocks freeze

• water expands when it thaws

• water expands when it freezes

Which of these statements is true?

• Chemical weathering always involves water

• Physical weathering always involves water

• Chemical weathering depends on temperature changes

• Biological weathering happens because rain water is slightly acidic

Which statement is true?

• Ice can transport only small rocks

• Wind can transport larger particles than water

• The slower water is moving, the larger the particles it can carry

• Water can transport larger particles than wind

Which is the best statement to complete this sentence?

Sedimentary rocks are formed when:

• sediments are compacted and then cemented

• sediments are cemented and then compacted

• sediments are buried and compacted

• rocks are weathered and eroded

Fossils are usually:

• skeletons of animals

• different layers of sediment

• very old animals

• the shapes of dead animals or plants that were buried in sediments