Rock Cycle review

Which statement best describes how sedimentary rock is formed?

• Flowing magma cooled quickly, creating many uneven layers

• Extreme pressure melted and formed minerals in uneven layers.

• Layers of mineral deposits were compressed over a long time period.

• Separate layers of lava cooled over time, hardening at different rates

In order for sedimentary rock to form, which of the following must occur?

• compaction

• intrusion

• oxidation

• metamorphism

What needs to happen for igneous rock to be transformed into sedimentary rock?

• Weathering and erosion need to wear away the igneous rock, forming particles that will eventually cement into sedimentary rock.

• Low temperatures at the poles need to freeze the igneous rock, cooling and hardening it into extremely dense sedimentary rock.

• Tectonic plates must collide near the igneous rock, driving it under the surface, where it melts into sedimentary rock.

• High pressure needs to compact the igneous rock, eventually melting it and forming sedimentary rock as it cools.

Which explanation describes how metamorphic rocks are formed?

• Metamorphic rock is formed when sedimentary and igneous rocks change over time under heat and pressure.

• Metamorphic rock is formed when earthquakes shake up the rocks so they are broken into small pieces.

• Metamorphic rock is formed when sedimentary rocks are broken down over time by wind and rain.

• Metamorphic rock is formed when lava that erupts from a volcano cools in the atmosphere.

Igneous rock is formed from cooling magma. Which process will change igneous rock into sedimentary rock?

• heat and pressure

• melting

• cooling

• weathering and erosion

Which type of rock could contain fossils of woolly mammoths?

• igneous

• metamorphic

• sedimentary

• minerals

Rocks are classified as igneous, sedimentary, or metamorphic based mainly on their

• texture and shape.

• method of formation

• grain size.

• mineral content.

A rock that is composed of several large, rounded pebbles and sand grains cemented together is most likely

• an igneous rock

• a sedimentary rock

• a rock formed by evaporation

• a rock formed by intense heat.

What is the change of rocks from one type to another type known as?

• metamorphism

• the rock cycle

• petrography

• consolidation

What type of igneous rock is smooth and glassy?

• basalt

• obsidian

• pumice

• granite