Rocks Practice

Sedimentary rocks form because of all of the following EXCEPT ____.

• water evaporating, leaving crystals behind

• sediments forming from solution

• crystals solidifying from magma

• sediments becoming pressed or cemented together

Which statement is correct regarding metamorphic rock formation?

• Small pieces of rocks are buried, squeezed, and cemented together.

• The temperature inside Earth is cooler which allows metamorphic rocks to form more quickly.

• Weathering and erosion cause rocks to break down to form metamorphic rocks.

• The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks.

_____ occurs as the result of pressure on loose sediment.

• Metamorphism

• Cementation

• Compaction

• Crystallization

Which best explains how a rock can become classified as a conglomerate?

• a rock made of only organic material and has been in the ground for many years

• a rock with large, rounded clasts that have been polished

• a rock with crystallized minerals as part of the composition

• a rock with angular clasts found at the edges of mountains

In which environment would sedimentary rocks most likely form?

• in an area undergoing mountain building

• near rocks exposed to plastic deformation

• in a body of water on Earth’s surface

• close to a magma chamber

The layers in schist are the result of

• cooling and crystallization.

• solidification of magma.

• pressure on an existing rock.

• cementation and compaction.

A rock is always ____.

• formed by heat and pressure

• made of molten material

• a mixture of minerals, organic matter, volcanic glass, or other materials

• either igneous or sedimentary

Metamorphic rocks that show layers of dark minerals alternating with layers of light minerals are classified as ____.

• nonfoliated

• extrusive

• intrusive

• foliated

What type of sedimentary rock is coarse-grained with angular fragments?

• conglomerates

• nonfoliates

• foliates

• breccias

A student finds a rock with seashells in it. What kind of rock is it?

• a metamorphic rock

• an extrusive rock

• a sedimentary rock

• an igneous rock