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Science-Chapter 4


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

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