Question: Choose your answer.

How has burning fossil fuels most caused a decline to the quality of air that people breathe?

OPTIONS:
- by adding particle pollution
- by creating a hole in the ozone layer
- by causing acid precipitation to fall
- by increasing the levels of carbon dioxide
My Answer: by adding particle pollution

Question: Choose your answer.

Which mass is undergoing the greatest amount of acceleration?

OPTIONS:
- 1 kg subjected to a force of 1 N
- 1 kg subjected to a force of 100 N
- 100 kg subjected to a force of 1 N
- 100 kg subjected to a force of 100 N
My Answer: 1 kg subjected to a force of 100 N

Question: Choose your answer.

Several horses grazed in a fenced area across from a home. On rainy days, soil would wash down a slope and run toward the home. After the horses were moved a few years later, the soil no longer washed down when it rained. What could account for this change?

OPTIONS:
- The grass grew and kept the soil intact.
- The fence kept the soil contained.
- The soil was completely gone.
- The amount of rain decreased.
My Answer: The grass grew and kept the soil intact.

Question: Choose your answer.

Food webs show feeding relationships among different types of organisms. Those organisms each have a specific niche. Which of the following best describes a function of decomposers in food webs?

OPTIONS:
- to recycle nutrients into soil
- to convert solar energy into food
- to provide food for secondary consumers
- to compete with secondary consumers for oxygen
My Answer:
to recycle nutrients into soil