Rain is the dominant form of precipitation across Pennsylvania, accounting for more than ____ of the total annual precipitation on average.
Snow is the other major form of precipitation, which generally accounts for less than ___ percent of the annual precipitation in southern Pennsylvania
Snow generally accounts for up to ___ percent of the annual precipitation in some northern counties.
The remainder of the precipitation in the form of recharge—precipitation that infiltrates the soil surface, trickles downward by gravity, and becomes the groundwater that feeds the springs, streams, and wells of Pennsylvania.
Sand and gravel aquifers contain large quantities of water which can be easily withdrawn; well yields of ________ are common.
amount of the 3% of fresh water of that is frozen, forming the polar ice caps, glaciers, and icebergs.
amount of the 3% total world water supply that is freshwater available as either surface water or groundwater
just over half
_________of the total population served by public water systems drink water from a groundwater source.
Although it has only 28% of the U.S. population, the arid
West accounts for _____ of the average water consumed daily due to extensive irrigation
0.6 and 2 feet
The International Panel on Climate Change (IPCC) estimates that the global average sea level will rise between _____________(0.18 to 0.59 meters) in the next century (IPCC, 2007).