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20 terms

unit 7 chapter

unit seven chapter test
STUDY
PLAY
What percentage of Earth's water is available for drinking and irrigation?
2.5%
When a water-bearing porous layer of rock, sand, or gravel is trapped between upper and lower layers of less permeable substances, it is _______.
an aquifer
The region of a lake where plants are able to attach to the bottom and still reach above the surface is known as the __________.
littoral zone
Marine ecosystems that occur on the ocean floor are termed _______.
benthic
In thermohaline circulation of global current systems, surface water is ________.
less salty, less dense, and warmer
The area that underlies the shallow water bordering continents is called the ________.
continental shelf
The exceptionally strong warming of the eastern Pacific is referred to as ________.
El nino
What type of farming has led to the destruction of mangroves?
shrimp farming
Why are coral considered mutualistically symbiotic organisms?
Because coral reefs are a combination of an animal and an algae.
What is our primary consumptive (as opposed to nonconsumptive) use of water?
irrigation
We build dams to ________.
generate electricity, prevent flooding and provide irrigation
Overpumping groundwater in coastal areas can cause ________ to move into aquifers, making the water undrinkable.
salt water
Xeriscaping can save water by ________.
planting native or drought-resistant plants with little or no water requirements
If oil accumulates in a body of water in small amounts over time as a result of leaks from boats and runoff from land, then this oil pollution is from _____________.
non-point sources
What is the direct cause of death for the aquatic animals during eutrophication?
a loss of dissolved oxygen in the water
Which of the following statements about drinking water is true?
Most bottled water is just purified tap water.
The "blue-baby" syndrome that suffocates infants is a consequence of excess ________ in the water supply.
nitrates
_______ is water that has been used and then treated before releasing back into the environment?
Effluent
A 2003 study reported that ________% of large-bodied fish and sharks were lost in the first decade of industrialized fishing.
90
Many recent studies indicate that to improve management of fisheries we need to ________.
set aside areas of ocean where systems can function without human interference.