An aquifer<span> is an underground layer of </span>water<span>-bearing </span>permeable rock, rock fractures or unconsolidated materials (gravel<span>, </span>sand<span>, or </span>silt<span>) from which </span>groundwater<span> can be extracted using a </span>water well<span>. The study of water flow in aquifers and the characterization of aquifers is called </span>hydrogeology<span>. Related terms include </span>aquitard, which is a bed of low permeability along an aquifer,[1]<span> and </span>aquiclude<span> (or </span>aquifuge<span>), which is a solid, impermeable area underlying or overlying an aquifer. If the impermeable area overlies the aquifer, pressure could cause it to become a confined aquifer.</span>
A. Belgium, France, and Germany
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Whatever formation it formated
Answer:
The main gases which play an important role in maintaining the temperature of the atmosphere are carbon dioxide and the water vapours. As the altitude increases, the concentration of these gases in the atmosphere decreases (due to gravity), which consequently results in decrease of temperature, which means there is not enough CO2 and water vapours to keep increasing the temperature.
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