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unit seven chapter test

What percentage of Earth's water is available for drinking and irrigation?


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 _______.


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?


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.


_______ is water that has been used and then treated before releasing back into the environment?


A 2003 study reported that ________% of large-bodied fish and sharks were lost in the first decade of industrialized fishing.


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.

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