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.Know More
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
The mantle present in the Earth's crust flows due to a process known as mantle convection; convection currents that transport heat to the surface of the Earth are responsible for this activity. These currents permit molecules to travel through liquids or gases, an activity known as convection.Full Answer >
The outer core of the Earth begins about 1,800 miles below the Earth's surface and is between 1,370 and 1,430 miles thick. It is composed of liquid iron and nickel with some trace elements.Full Answer >
Original remains are the unchanged fossilized remains of animals and plants. They can include things like animals trapped in ice and insects fossilized in a resin, such as amber.Full Answer >
The crust, the outermost layer or surface layer, is the thinnest layer of Earth. In addition to being thin, the crust layer has the most variance when it comes to thickness. This diverse layer mostly ranges from 5km to 30km in thickness but can reach depths of 70km.Full Answer >