Select the correct answer. This map shows the amount of groundwater (GW) in parts of Pakistan. Farmers in Pakistan once relied on rivers and canals for their water supply, but as cities expanded and populations grew, more farmers used groundwater for their crops. When this map was made, there were no laws restricting how many wells could be built in Pakistan to remove groundwater. What would be the best solution to help Pakistan conserve their water supply?

A.
Increase the number of groundwater wells in all three regions.
B.
Build more wells in region 3, and restrict building in all other regions.
C.
Pass laws restricting well building in region 1, but increase wells in regions 2 and 3.
D.
Pass laws restricting all wells, with the fewest restrictions in Region 1.
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Which of the following might a chemist choose to study? a. glacier movement in alaska b. better ways to recycle plastics c. the effects of hurricanes on turtle populations d. the vibrations in bridges caused by big trucks

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas.in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point