APES April break review work

This is the humus or layer of organic material.

• C horizon
• O horizon
• B horizon
• A horizon

What is the land area that supplies the water in a river system?

• watershed
• divide
• tributary
• eutrophication

The Mississippi River watershed covers _______ of the United States.

• 1/3
• 1/2
• 3/4
• 1/5

Which of the following is NOT a way that lakes form?

• glaciers
• tsunamis
• volcanoes
• dams built by people

A lake that stores water for human use is called a ____________.

• dam
• oxbow lake
• reservoir
• crater lake

The build up of nutrients in a lake is a process called ________________.

• eutrophication
• volcanic eruption
• algae buildup
• pond death

What is the first step to eutrophication?

• Plants die.
• Animals die.
• Algae becomes so thick that it blocks sunlight.
• Decaying material from the dead organisms pile up and make the lake shallower.

Which human activity can speed up the process of eutrophication?

• Building cities
• Nuclear power plants
• Deforestation
• Farming

Bacteria release which nutrients into lakes as they decompose dead organisms?

• oxygen and nitrogen
• nitrogen and carbon
• carbon and phosphorous
• phosphorous and nitrogen

Which organisms use the nutrients produced by decomposers in lakes?

• bacteria
• fish
• plants
• algae