Natural environment

Natural environment

Related to any physical feature of the earth's natural environment.

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Natural environment > Volcano

acid

Natural environment; Volcano

A descriptive term applied to igneous rocks with more than 60% silica (SiO2).

active volcano

Natural environment; Volcano

A volcano that is erupting. Also, a volcano that is not presently erupting, but that has erupted within historical time and is considered likely to do so in the future.

agglutinate

Natural environment; Volcano

A pyroclastic deposit consisting of an accumulation of originally plastic ejecta and formed by the coherence of the fragments upon solidification.

alkalic

Natural environment; Volcano

Rocks which contain above average amounts of sodium and/or potassium for the group of rocks for which it belongs. For example, the basalts of the capping stage of Hawaiian ...

andesite

Natural environment; Volcano

Volcanic rock (or lava) characteristically medium dark in color and containing 54 to 62 percent silica and moderate amounts of iron and magnesium.

ash

Natural environment; Volcano

Fine particles of pulverized rock blown from an explosion vent. Measuring less than 1/10 inch in diameter, ash may be either solid or molten when first erupted. By far the most ...