U2 Topic 4 - Metamorphic Rocks

Metamorphic rocks result from the

• erosion of rocks

• recrystallization of rocks

• cooling and solidification of molten magma

• compression and cementation of soil particles

While a geology student was walking along several outcrops, she found a rock specimen that showed the pictured characteristics. This specimen should be identified as:

• hornfels

• slate

• gneiss

• anthracite

The metamorphism of a sandstone rock will cause the rock to

• be melted

• contain ore fossils

• become more dense

• occupy a greater volume

Which rock is most likely a metamorphic rock?

• a rock showing mud cracks

• a rock containing dinosaur bones

• a rock consisting of layers of rounded sand grains

• a rock composed of distorted light-colored and dark-colored mineral bands

Which diagram best represents a sample of the metamorphic rock gneies?

• 
• 
• 
• 

Which characteristics are most useful for identifying the conditions under which a metamorphic rock was formed?

• color and luster

• shape and mass

• hardness and size

• composition and structure

Refer to the Rock Cycle diagram. Which type(s) of rock can be the source of deposited sediments?

• igneous and metamorphic rocks, only

• metamorphic and sedimentary rocks, only

• sedimentary rocks, only

• igneous, metamorphic and sedimentary rocks

Which statement about the formation of a rock is best supported by the rock cycle ?

• Magma must be weathered before it can change to metamorphic rock.

• Sediment must be compacted and cemented before it can change to sedimentary rock.

• Sedimentary rock must melt before it can change to metamorphic rock.

• Metamorphic rock must melt before it can change to sedimentary rock.

Heat and pressure because of magma intrusions may result in

• vertical sorting

• graded bedding

• contact metamorphism

• chemical evaporation

What is one difference between the metamorphic rocks quartzite and hornfels?

• Hornfels is foliated, quartzite is nonfoliated.

• Hornfels contains plagioclase; quartzite does not contain plagioclase.

• Hornfels is produced by regional metamorphism, quartzite is produced by contact metamorphism.

• Hornfels is medium grained; quartzite is fine grained.