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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

luster

Earth science; Geology

The manner in which light reflects from the surface of a mineral, described by its quality and intensity.

mafic

Earth science; Geology

Referring to a generally dark-colored igneous rock with significant amounts of one or more ferromagnesian minerals, or to a magma with significant amounts of iron and magnesium.

magma

Earth science; Geology

Molten rock. Magma may be completely liquid or a mixture of liquid rock, dissolved gases and crystals. Molten rock that flows out onto the Earth's surface is called lava.

magma chamber

Earth science; Geology

A body of molten rock and solid crystal mush beneath the Earth's surface. When this chamber cools and solidifies, it is called a pluton.

magnetic reversals

Earth science; Geology

Earth's magnetic field occassionally "flips" or reverses polarity. This means that, if a polarity reversal happened today, your compass would point south instead of north!

mantle

Earth science; Geology

That portion of the Earth below the crust and reaching to about 2,780 km, where a transition zone of about 100 km thickness separates it from the core.

Moho

Earth science; Geology

The boundary separating the base of the Earth's crust and the top of the mantle. The Moho occurs at a depth of 5-10 kilometers beneath oceanic crust and about 35-65 kilometers ...