Aquatic 1st Six Weeks

Eutrophication is caused by

• runoff of excessive fertilizer and nutrients
• cleaning up waterways
• using nuclear energy
• using solar energy

An area where animals and plants have stopped thriving is known as a

• desert
• dead zone
• tundra
• taiga

How do nitrate levels affect the health of a water system?

• As nitrates decrease, there is an increase in plant growth
• nitrates cause bacteria to consume large protein molecules
• nitrates cause aquatic organisms to die due to oxygen depletion
• as nitrates increase, there is an increase in dissolved oxygen

Which would a scientist expect to find in a lake that experienced a sudden increase in nitrate levels?

• an increase in temperature
• an increased number of fish
• an increase in dissolved oxygen
• an increased amount of algae and aquatic plants

 ______is caused by gravity and results in particles collecting at the bottom.

• containment
• sedimentation
• stewardship
• potable

_________ can cause the water surface to turn green.

• algae blooms
• contamination
• freshwater
• eutrophication

____________________ occurs when water contains excess nutrients and excess plant growth.

• sedimentation
• algae blooms
• stewardship
• eutrophication

________________ occur naturally but too much can be dangerous in a water supply; the majority come from fertilizers and erosion.

• turbidity
• nitrates
• safe drinking water
• phosphates

_____________________ are also good in small amounts but dangerous if unchecked; commonly, they enter the water supply from human and animal waste, laundry, and cleaning solutions.

• turbidity
• water treatment
• phosphates
• pollution

Variety of all living things in an ecosystem

• eutrophication
• climate
• ecosystems
• biodiversity