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27 Cards in this Set
- Front
- Back
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What are the three types of rocks?
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Sedimentary
Metamorphic Igneous |
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Sedimentary rocks are classified into 3 categories. List them.
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Detrital
Chemical Organic |
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How are rocks classified?
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Composition and Texture
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What are some examples of sedimentary rock?
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sandstone
rock salt |
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What is an example of igneous rocks?
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Granite
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How do igneous rocks form?
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melting and cooling. When it cools it
solidifies which means it gets harder. |
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How do sedimentary rocks form?
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Small pieces of minerals and rocks (erosion) become cemented or compacted together.
Cementing of weathered materials. |
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How are metamorphic rocks formed?
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Chemical change due to heat and pressure. Va. has lots of these rocks as indicated that the area has had intense heat and pressure.
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What process does the rock cycle describe?
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one type of rock can be changed into another type of rock.
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What is the molten rock inside the Earth called?
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Magma
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What is the magma that reaches the Earth's surface called?
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Lava
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Igneous rock with large crystals?
Igneous rock with small crystals? |
Igneous rocks formed from magma have large crystals.
Igneous rocks formed from lava have small crystals. |
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Name some igneous rocks.
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Granite scoria
Basalt Obsidian pumice |
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Name some metamorphic rocks.
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gneiss
slate marble schist quartzite |
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Name some sedimentary rocks.
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limestone
shale |
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What would cause a piece of igneous rocks not to have crystals?
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They cooled too quickly.
An example is obsidian. |
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What does extrusive mean?
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The surface of the Earth.
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What does intrusive mean?
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Below the surface of the Earth.
So if a piece of granite cools below the surface of the Earth, its called an igneous intrusive rock. |
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Which industry uses a lot of crushed stone?
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Construction
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Why is limestone a valuable resource in Va.?
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It is used for concrete.
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Slate in a common rock used for roofing shingles. Why?
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Because it can be split apart into thin, flat layers.
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Why are some extrusive (surface) igneous rocks glassy and smooth?
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They cooled really fast and didn't have time to make crystals.
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Which type of magma has the highest silica content.
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Granitic 70%
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What are two types of textures found in metamorphic rocks?
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unfoliated: break apart so they are rough Marble and Quartz
foliated: minerals are arranged in layers or bands. |
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What are the most important things used to determine how a rock is formed?
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composition and texture
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What are sediments?
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small pieces of rocks and minerals and the remains of living things
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What are rocks made up of?
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minerals
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