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Science-Chapter 4


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Is formed when quartz, feldspar, hornblende, and mica combine
Intrusive igneous rock
Rocks that form below the earth's surface
Extrusive igneous rock
Rocks formed when lava cools on or near the earth's surface
Orthorhombic crystal system
Hot, melted rock (molten rock) material beneath the earth's surface
5 Characteristics minerals share
All minerals are formed by natural processes, Minerals are inorganic, Minerals are solid, every mineral is an elementor compound with a chemical composition unique to that material, The atoms in a mineral are arranged in a pattern that is repeated over and over again
Rock cycle
Shows how all these processes interact to form & change the rocks around you
A naturally occuring inorganic solid with a definate structure and composition
Common rock-forming minerals
Quartz, feldspar, hornblende, mica
When atoms of a substance are not arranged in a definate structure (opals)
Triclinic crystal system
Flat bottom with a pointed top, six sides
Molten rock from a volcano flowing out onto the earth's surface
Rhombohederal crystal system
Sides are not all perfectly equal
Cubic crystal system
Crystal that is a perfect cube, sides are all perfectly equal
Tetragonal crystal system
A mixture of minerals, mineraloids, glass, or organic matter
Igneous rocks
Formed when molten material reaches the surface and cools
Monoclinic crystal system
All sides are equal
When substances are mixed together, but each keeps it's properites
The 3 types of rocks
Sedimentary, igneous, metamorphic
5 Rock formation processes
Weathering, erosion, compaction &cementation, melting & cooling, heat & pressure
Hexagonal crystal system
Crystal that has six sides

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