Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > 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 eruption

Earth science; Geology

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 ...