6.10b

Rocks are classified by -

• how they were formed.
• when they were formed.
• where they were formed.
• their color when formed

Sedimentary rocks can have layers of different colors. This occurs when –

• molten rock seeps into large cracks underground.
• extreme pressure causes minerals to separate
• different minerals are deposited at different times.
• seasonal patterns change the rate of erosion.

Which of the following is one of the final processes in the formation of sedimentary rock?

• Melting
• Cementation
• Flowing
• Separation

Metamorphic rock forms where any kind of rock –

• is crystalized after being liquid rock.
• contains fossils of marine organisms
• is changed by the extreme heat and pressure.
• is composed of cemented sediment.

Which of the following features of a rock would classify it as definitely an igneous rock?

• Began its formation process millions of year in the past
• Created through slow, naturally occurring processes
• Formed when minerals were heated, then cooled
• Resulted from liquid rock being ejected from a volcano

The interlocking crystals of an igneous rock help to classify it since these crystals are evidence of how the rock formed. The crystals are a result of –

• quartz coming out of solution.
• particles forming layers.
• chemical reactions of minerals.
• melted rock that cooled.

Which of the following processes is one of the early steps in the formation of sedimentary rock?

• Weathering of existing rock
• Crystallization of molten minerals
• Melting of rock in volcanoes
• Chemical reactions that produce heat

Sedimentary rock can be changed into igneous rock if sediments are –

• compacted.
• deposited.
• weathered.
• melted.

Which type of rock results from melting and cooling of magma?

• Igneous
• Metamorphic
• Sedimentary
• Extrusive

Wind, water, and ice breaking down rock is called

• Erosion
• Deposition
• Compaction
• Weathering