EHST 2110 Exam 4 Iverson East Carolina
University- with Complete Solutions
71% - ANSWER - What percent of the earth's surface is covered by water?
97% - ANSWER - How much of Earth's water is salt water?
3% - ANSWER - How much of Earth's water is freshwater?
65-70% - ANSWER - How much of a human's body weight is water?
1 kg of food and 2.5 kg of water - ANSWER - A typical adult requires:
1.5 Billion - ANSWER - How many people lack access to adequate supplies of safe water in
developing countries?
California - ANSWER - What state uses the most water?
40% - ANSWER - What percentage of the world's population live in water stressed areas?
20 Billion - ANSWER - Earth's 1% of fresh water can adequately satisfy how many people?
30 inches - ANSWER - What is the U.S's average annual rainfall?
Rainfall - ANSWER - Meteorological droughts are based on:
soil moisture - ANSWER - Agricultural droughts are based on:
, Waste treatment facilities and septic systems - ANSWER - Degradation of groundwater supplies
often occurs from:
Agriculture - ANSWER - Largest user and waster of water
water conservation - ANSWER - reducing overall use, reducing waste, and recycling water for
other uses
stream flow or ground water levels - ANSWER - Hydrologic droughts are based on:
96% - ANSWER - How much of Earth's freshwater is ground water?
25% - ANSWER - How much of the U.S.'s water supply s ground water?
Soil filtration - ANSWER - Groundwater is usually cleaner and purer than most surface waters
due to:
groundwater depletion - ANSWER - persistent lowering of the water table
Ogallala - ANSWER - world's largest underground water reserve
33% - ANSWER - Ogallala supplies nearly _________ of all water for irrigation in the US
Salt water intrusion - ANSWER - migration of salt water from the ocean to pumping wells due to
excessive water level drops in freshwater aquifers
confining bed - ANSWER - largely impermeable layers that hinder water's movement (ex. clay)
Aquifer - ANSWER - permeable rock or sediments that transmit water easily (ex. sand or gravel)
Black Creek, PeeDee, and Beaufort - ANSWER - Name three of NC's Hydrogeologic Units
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