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amphibole
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a mineral; any of a large group of structurally similar hgydrated
double silicate minerals, such as hornblende - BACK>> |
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a hard, dense, dark volcanic rock composed chiefly of plagioclase,
pyroxene, and olivine and often having a glassy appearance, one
of the most abundant forms of igneous rock on earth with more
than 90% of all volcanic rock and 90% of basic igneous rock being
basalt - BACK>>
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a homogenous solid formed by a repeating three-dimensional pattern
of atoms, ions, or molecules and having fixed distances between
constituent parts; a mineral, especially a transparent form of quartz
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a sudden movement of the earth's crust caused by the release of
stress accumulated along geologic faults or by volcanic activity
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the group of natural processes, including weathering, corrosion,
and abrasion, by which a material is eroded, or worn away - BACK>> |
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any of a group of abundant rock-forming minerals occuring in igneous,
sedimentary, and metamorphic rocks and consisting of silicates of
aluminum with potassium, sodium, and calcium -
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a remnant or trace of an organism of a past geologic age, such as
a skeleton, embedded and preserved in the earth's crust - BACK>> |
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the scientific study of the origin, history, and structure of
the earth - BACK>>
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the physics of the earth and its environment, including the physics
of fields such as meteorology, oceanography, and seismology - BACK>> |
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a banded or foliated metamorphic rock, usually of the same composition
as a granite - BACK>> |
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| granite |
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a common, coarse-grained hard igneous rock consisting chiefly of
quartz, orthoclase or microcline and mica, used for building - BACK>> |
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a form of basalt characterized by columnar jointing which produces
six sided prisms of basalt forming at right-angles to the surfaces
of flows, dykes, sills - BACK>> |
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types of rocks formed by the solidification from a molten or liquid
state - BACK>> |
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a body of igneous rock which has forced itself into pre-existing
rocks, either along some definite structural feature, or by deformation
and cross-cutting of the invaded rocks - BACK>> |
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molten rock that reaches the earth's surface through a volcano or
fissure, often referred to in the form of lava flows - BACK>> |
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a common sedimentary rock consisting mostly of calcium carbonate,
often used as a building material - BACK>> |
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the molten rock material under the earth's crust, from which igneous
rock is formed by cooling - BACK>> |
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marble
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a metamorphic rock formed from limestone or dolomite, often irregularly
colored by impurities and used especially in architecture and sculpture
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rocks that are created by the process where rocks are altered in
composition, texture, or internal structure by extreme heat, pressure,
and the introduction of new chemical substances - BACK>> |
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a stony or metallic mass of matter that has fallen to the earth's
surface from outer space - BACK>> |
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a naturally occuring, homogeneous inorganic solid substance having
a definite chemical composition and characteristic crystalline structure,
color, and hardness - BACK>> |
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a black or banded hard volcanic glass that displays shiny curved
surfaces when fractured and is formed by the rapid cooling of lava
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branch of geology that deals with the origin, composition, structure,
and alteration of rocks - BACK>> |
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any group of crystalline silicateminerals common in igneous and
metamorphic rocks and containing two metallic oxides, as of magnesium,
iron, or calcium - BACK>> |
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a very hard mineral composed of silica found worldwide in many different
tyles of rocks, including sandstone and granite - BACK>> |
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a fine-grained extrusive volcanic rock, similar to granite in composition
and usually exhibiting flow lines - BACK>> |
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a relatively hard, naturally formed mineral or petrified matter;
a naturally forming aggregate of mineral matter constituting a significant
pat of the earth's crust - BACK>> |
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a sedimentary rock formed by the consolidation and compaction of
sand and held together by a natural cement such as silica - BACK>> |
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rocks formed from material derived from pre-existing rocks by processes
of denudation, together with material of organic origin, relating
to rocks formed by the deposition of sediment - BACK>> |
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a sedimentary rock composed of layers of claylike fine-grained sediments
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compounds containign silicon, oxygen, and one or more metals; any
of a large group of minerals, forming over 90% of the earth's crust
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the study of rock strata especially the distribution, deposition
and age of sedimentary rocks - BACK>> |
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any of the chemical or mechanical processes by which rocks exposed
to the weather undergo changes in character and break down - BACK>> |
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