rocks and minerals
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Name 5 properties used to identify minerals.
color, streak, cleavage, hardness, and magnetism
Describe the process of formation of each type of rock: igneous, metamorphic, and sedimentary.
Igneous rocks are formed from magma, lava, and other volcanic actions in the earth and outside the earth. Metamorphic rocks are formed deep in the earth in extreme heat and pressure. Sedimentary rocks are formed little by little with layers of sediments and pressed together.
Explain the difference between intrusive and extrusive igneous rocks.
Intrusive rocks are formed under the Earth's crust and Extrusive rocks are formed above the Earth's crust.
Describe what the rock cycle is.
There are three basic kinds of rocks that change from one form to another.
What is an ore?
a rock-bearing mineral
How is the hardness of minerals measured?
Moh's Scale of hardness
What is the softest mineral? What is the hardest minerals?
talc and diamond
Which mineral can be scratched with your fingernail, quartz or calcite?
In what type of rock might you find fossils?
Why is color not the best property for identifying minerals?
Many minerals have the same color.
Give three examples of metamorphic rocks.
- Marble (used to be limestone)
- Slate (used to be shale)
- Shist (used to be slate)
- quartzite (used to be sandstone)
Minerals and rocks that cool slowly will have _______ crystals with a _________ texture.
What is another name for pyrite?
Gneiss has __________ crystals and ________ of layers.
True or false. Sedimentary rocks are formed in layers all at once.
False. Sedimentary rocks are formed one layer at a time.
What would be the best rock to build a building out of: granite or sandstone. Why?
Granite, because it is very hard. Sandstone is crumbly.
Describe how luster and cleavage are used to identify minerals.
Luster describes the way light reflects off a mineral. Cleavage describes the way a mineral breaks apart.
What is a mineral?
Minerals are nonliving substances that make up rocks.
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