Geology

Geology

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

Industry: Earth science

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Geology

half-life

Earth science; Geology

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

hardness

Earth science; Geology

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

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.

Hawaiian" eruptions may occur along fissures or fractures that serve as linear vents, such as during the eruption of Mauna Loa Volcano in Hawaii in 1950, or they may occur at a central vent such as ...