Why is groundwater mining linked to ground subsidence? Discuss the factors that create the subsidence and why the damage cannot be repaired
What will be an ideal response?
ANSWER: ?Groundwater mining removes water from the subsurface aquifer for human use. Aquifers contain sand and gravel whose pore spaces are filled with water. When the water is removed, sand grains pack more tightly together. This decreases the volume of the aquiferous sand layer and causes subsidence over a large area. Clays and silts fill the pore spaces, so injection of water back into the aquifer cannot re-expand the sand layer and repair the subsidence. The large area affected also makes repair difficult.
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What is the velocity of a stream with a discharge of 2000 m3/s if the channel is 200 meters across and 5 meters deep?
A. 2 m/s B. 4 m/s C. 20 m/s D. 40 m/s
What is NOT one of the three components of the problem of world food distribution?
A) problem of transporting food from one place to another B) genetic defects of crops that are spread unintentionally by major food companies C) serious disruptions in food supply in developing countries are traceable to problems of marketing and storage D) the inequitable allocation of food E) None of the above are components of the problem of world food distribution.
Aphelion
What will be an ideal response?
Starch and cellulose are examples of ________
A) sterols B) carbohydrates C) nucleic acids D) lipids E) proteins