A good aquifer is one that carries a large amount of water and recharges quickly. Some aquifers are even under pressure so that little if any work is required to bring water to the surface. An aquifer is any body of groundwater into which a well can be dug.Continue Reading
Aquifers are buried porous rocks or masses of unconsolidated material, such as gravel, sand or silt, that are saturated with water. When one digs into such a rock or mass of material, water seeps into the hole, forming a well. When the layer of water-bearing material has porous materials above or beneath it, it's not under much pressure, and energy must be used to obtain the water. In artesian wells, however, the layer of water-bearing material is sandwiched between non-permeable materials, such as granite or clay. In these cases, the water is under pressure.
Aquifers have limited supplies of water and rely on precipitation to be refilled. Different aquifers refill at different rates depending on the amount of precipitation and the nature of the overlying materials. Human overuse of aquifers can deplete them or, in the case of coastal aquifers, cause saltwater to seep in, rendering them unusable for drinking or agriculture.Learn more about Layers of the Earth
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 helpful for filtering bacteria and other solid matter. Clay particles and other minerals slow down or stop dissolved substances so they don't travel with the water, providing another layer of filtration.Full Answer >
An unconfined aquifer is a source of underground water that seeps through a permeable layer of dirt or sand directly to the ground surface above. Since the pressure of such aquifers is equal to or less than atmospheric pressure, drilling may not result in increased water levels in the area.Full Answer >
According to a report in the “Geological Society of America Bulletin,” diastrophism may be caused by contraction of the earth, convection currents, the formation of large magma pockets, sialic material leaking out of the mantle, conversion of sial to mantle and serpentinization or deserpentinization of the upper mantle. Diastrophism can create mountains, archways, depressions and other geological features.Full Answer >
The Department of Earth and Ocean Sciences at the University of British Columbia defines geology as the study of the Earth and its composition, which includes the crust. A geologist covers everything from studying the times when dinosaurs roamed the Earth to predicting modern day earthquakes.Full Answer >