Igneous Rock:
A rock formed by the crystallization of magma or lava.
Ignimbrite:
An igneous rock formed by the lithification of ash flow or pyroclastic flow deposits.
Impermeable Layer: ...
Igneous Rock:
Rock formed when molten (melted) materials harden.
Indentured Labor:
Work performed according to a binding contract between two parties.
igneous rock -- Any rock solidified from molten or partly molten material.
igneous rock A rock that has crystallized from a molten state.
inclined bedding (cross-bedding) Bedding laid down at an angle to the horizontal, as in many sand dunes.
Igneous rocks are produced by the crystallization of magma. This process can occur at the Earth's surface or beneath the ground.
It separates the deeper, mafic igneous rock of the Central Pacific Basin from the partially submerged continental areas of felsic igneous rock on its margins.
Evidence favoring some early non-mafic crustal rocks is found in the discovery of the mineral Zircon (a gemstone), ZrSiO4, at various localities, mainly Australia, where non-igneous rocks have been found to contain this mineral as an accessory ...
 See also: Surface, Area, Sediment, Plate, Tectonic
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