Rockin'

Jennifer was investigating granite, a type of rock that forms when magma deep below the Earth's crust cools off and hardens. What type of rock is granite?

• bedrock

• igneous

• sedimentary

• metamorphic

Shale is formed from clay, silt or mud particles that have been compacted together by pressure. What type of rock is shale?

• bedrock

• igneous

• sedimentary

• metamorphic

Granite is a coarse or medium-grained rock that is rich in quartz and feldspar. It is formed when bodies of magma cool and harden deep below the earth. What type of rock is granite?

• bedrock

• igneous

• metamorphic

• sedimentary

Under what conditions can igneous rock be transformed into metamorphic rock?

• if it is forced deep into Earth, where it melts into magma

• if it is heated and put under pressure for long periods of time

• if layers of sand accumulate over it and harden over a period of time

• if it is exposed at the surface and is weathered over a period of time

Sedimentary rock is formed when rock fragments, minerals, and the remains of plants and animals are deposited as sediments and are then

• chemically weathered by water.

• compacted and cemented together.

• recrystallized under the weight of the layers.

• melted due to increased temperature and pressure.

Jill's teacher made a peanut butter and jelly sandwich and explained that one type of rock is formed when layers of sediment are squeezed and cemented together. After the rock is formed, you can still see the layers in the rock. What kind of rock is described?

• mineral rock

• igneous

• metamorphic

• sedimentary

If igneous rock forms above ground after a volcanic eruption, it ________________ forming ____________ igneous rock, such as obsidian which is a naturally occurring volcanic glass.

• cools quickly, extrusive

• cools quickly, intrusive

• cools slowly, extrusive

• cools slowly, intrusive

Molten hot magma that cools very slowly can cause ______________ in igneous rock.

• mineral layering

• glass-like formations

• settling of precious metals

• the formation of large crystals

Rocks are composed of different types of

• soil

• sand

• minerals

• water crystals

____________ rocks that are changed by heat and pressure

• igneous

• metamorphic

• sedimentary

• mineral