aquifier
If its an underground reservoir for water, it could possibly be an Aquifer.
The cycle that includes an underground reservoir of fossil fuels is the carbon cycle. This cycle involves the exchange of carbon between the atmosphere, oceans, soil, and living organisms. Fossil fuels are formed from the remains of ancient plants and animals that were buried underground and transformed over millions of years.
Magma chamber? Or the lithosphere or a mantle plume, depending on where the volcano is.
Over thousands of years rain water seeps through cracks in the Earth's crust and collects in underground reservoirs between the crust and the mantle. The mantle heats the water into a super-heated liquid and, voila!, you have a geothermal reservoir!
water
A Magma Reservoir is a Magma Chamber so to speak. It is an underground cavity containing molten rock, esp. below a volcano.
A reservoir , artificial lake,storage pond or impoundment from a dam is used to store water. Reservoirs may be created inconventional construction techniques such as brickwork or cast concrete.The term reservoir may also be used to describe naturally occurring underground reservoirs such as those beneath an oil or water well.
Groundwater collects when rainwater or surface water percolates through soil and rock layers until it reaches an impermeable layer, forming an underground reservoir. This reservoir can feed into wells, springs, and aquifers.
reservoirs and water storage tanks and towers, typically
No - Blithfield was always intended as a drinking water reservoir, and was planned before 1939. It was formed by building a dam to block the river Blith. Its history is here: http://www.blithfieldeducationcentre.co.uk/reservoir.htm You may be thinking of the explosion at RAF Fauld in 1944, when an underground munitions dump exploded with the loss of about 75 lives: http://en.wikipedia.org/wiki/RAF_Fauld_Explosion
A dammed lake is a man-made reservoir created by blocking a river with a dam to store water for various uses. An aquifer is an underground layer of rock or soil that holds water, serving as a natural reservoir. Dammed lakes are surface water sources, while aquifers store water underground.
The carbon cycle includes a reservoir underground stored as fossil fuels, such as coal, oil, and natural gas. These fossil fuels store carbon that was once part of living organisms and play a significant role in the exchange of carbon between the geosphere and the atmosphere.