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Geology

The science that comprises the study of the solid Earth and the processes by which it is shaped and changed.

Contributors in Geology

Geology

Harmonic tremor

Earth science; Geology

Continuous rhythmic earthquakes in the Earth's upper lithosphere that can be detected by seismographs. Harmonic tremors often precede or accompany volcanic eruptions.

Granodiorite

Earth science; Geology

An intrusive igneous rock similar to granite, but contains more plagioclase than potassium feldspar.

Half-life

Earth science; Geology

The time required for one-half of the atoms of a radioactive substance to decay.

Graded bed

Earth science; Geology

A sediment layer with a gradation of grain size from large grains to finer grains.

Hardness

Earth science; Geology

Resistance of a mineral to scratching, determined on a comparative basis by the Mohs scale.

Graben

Earth science; Geology

An elongate block of rock down-dropped along roughly parallel faults.

Grus

Earth science; Geology

Coarse sand and gravel that forms from weathering of granitic rocks

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