Examlex
_____ refers to a trusted third party that provides authentication services in public key encryption schemes.
Caldera
A broad volcanic depression, generally the result of a substantial eruption followed by the fall-in of the volcano's opening.
Banded Iron Formations
Layers of iron-rich minerals alternated with silica or chert, deposited in marine environments over 2.5 billion years ago and are important iron ore sources.
Metal-rich Fluids
Liquids emanating from the Earth's crust, usually heated by magma, that are high in dissolved metals, often found in volcanic and hydrothermal areas.
Magma
A molten rock material beneath the earth's surface, which can solidify to form igneous rocks.
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