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Section 2: Earth's Water

Earth's Water


1.	__________ use the greatest percentage of freshwater in the United States. Need a Hint?
		A)	Farms
		B)	Governments
		C)	Industries
		D)	Residents


2.	__________ is difficult to remove from sewage and wastewater and contributes to bacterial and algal overgrowth in freshwater. Need a Hint?
		A)	carbon
		B)	lead
		C)	nitrogen
		D)	oxygen


3.	What term is used to describe all the water on Earth’s surface? Need a Hint?
		A)	troposphere
		B)	oceans
		C)	aquifer
		D)	hydrosphere


4.	What is the source of power that drives the water cycle? Need a Hint?
		A)	nuclear power plants
		B)	the Sun
		C)	gravity
		D)	tides


5.	What is the measure of salt concentration in seawater called? Need a Hint?
		A)	salinity
		B)	molarity
		C)	density
		D)	aquation


6.	What process is used to remove salt from seawater so that it can be used by humans? Need a Hint?
		A)	precipitation
		B)	desalination
		C)	denaturation
		D)	aeration


7.	What percentage of the hydrosphere is actually liquid freshwater? Need a Hint?
		A)	0.60%
		B)	72%
		C)	97%
		D)	2.10%


8.	During the municipal treatment of water, a process is used to combine air with dissolved harmful, organic substances and convert them to harmless compounds. What is this process called? Need a Hint?
		A)	sedimentation
		B)	aeration
		C)	coagulation
		D)	filtering


9.	What chemical is used to kill any microorganisms that may have remained in the water after the initial cleanup? Need a Hint?
		A)	chlorine
		B)	lime
		C)	alum
		D)	silicon dioxide


10.	Seawater is desalinated commercially in some areas of the world by _____________. Need a Hint?
		A)	reverse osmosis
		B)	precipitation
		C)	distillation
		D)	adsorption