The type of rock that works best as an aquifer is volcanic rock that fills in as rubble between flows. This type of rock is highly porous and rather permeable, permitting significant water movement. More »

An aquifer map shows the regional location of various aquifers and the type of aquifers present in those regions. Types of aquifers include carbonate-rock aquifers, sandstone aquifers, igneous or metamorphic rock aquifer... More »

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The main characteristic of an aquifer is its permeability. Permeability is the ability of a liquid and a gas to pass through the surface. It is very important to determine the aquifer's permeability in order to predict t... More »

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Pumice rock has a eutaxitic texture characterized by a frothy, glassy vesicular surface that makes the volcanic rock extremely porous. The presence of numerous gas bubble perforations enables pumice to float on water. More »

Moving water that flows through the porous rock of an aquifer is filtered by the tiny pore spaces in the rock. The pore size determines the size of the particulate matter that flows through; smaller pore sizes are helpfu... More »

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Bauxite ore is formed when the surrounding soil or rock is dissolved by natural weathering processes until it forms a new type of rock that is usually rich in aluminum ore. Though both types are used for aluminum product... More »

The specific type of rock that forms when magma cools at the Earth's surface is extrusive igneous rock. Igneous rock forms when magma cools, but where the magma cools determines the type of igneous rock that forms. Igneo... More »