Isabella saw a chart that showed changes in the population over the past 500 years. She was surprised that the growth dramatically increased in the last 300 years.

What is the cause of an overall increase in the population?

• 
  The death rate is greater than the birth rate.

• 
  The birth rate is greater than the death rate.

• The birth rate and the death rate are almost equal.

• The death rate and people moving into an area are equal.

Isabella saw a chart that showed changes in the population over the past 500 years. She was surprised that the growth dramatically increased in the last 300 years.

What was the reason for the increase in population since the 1700s?

• More births allowed people to work more on their land and have more food to eat.

• Agriculture began to improve, and farmers could use antibiotics, fertilizers, and pesticides on their crops.

• The Industrial Revolution improved the availability of food and clean water to more people through technology.

• The birth rate increased because people could travel from place to place to find food.

As Earth’s population continues to grow, the need for resources also increases. Certain necessary resources will not last unless people begin using less of them.

The practice of using less of a resource to keep it around for a longer time is called

Tags

NGSS.MS-ESS3-4

People must make changes to ensure that future generations have access to natural resources. People must maintain the natural resources we have at a certain quality for a certain period of time.

What is the practice of maintaining resources called?

• 
  replanting

• reclamation

• 
  constraint

• 
  sustainable use

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NGSS.MS-LS2-5

Harry lives in a city, and he has a lung condition known as asthma. On certain days, Harry has to stay inside because pollutants in the air make it difficult for him to breathe.

Which of these pollution sources are nonpoint sources that might bother Harry if he goes outside? Choose the two that apply.

• cars on the highway

• his gas-fueled lawn mower

• nearby factories

• smoke from their grill

Tags

NGSS.MS-ESS3-4

Sierra lives in a southwestern town in a valley where air pollutants sometimes settle. The mountains that surround the town keep air pollution from blowing away. Sometimes Sierra can actually see the pollution in the air.

Which choice is NOT a source of outdoor air pollution?

• car emissions

• 
  factory emissions

• 
  radon gas

• 
  volcanic eruptions

Choose the words that correctly complete the paragraph.

Gina is trying to reduce the number of indoor pollutants in her home. Indoor pollutants include pet hair and dust, which are

_______, _______.

• smog, and radon and carbon monoxide which are, smoke

• allergens , and radon and carbon monoxide, which are gases.

• smoke, and radon and carbon monoxide, which are gases.

• allergens, and radon and carbon monoxide, which are smog.

If you have ever noticed a sharp odor in the air after a thunderstorm, you might be smelling ozone. Ozone can be formed from oxygen gas when lightning passes through the air.

Which statement is true about ozone?

• Ozone helps human health no matter where it occurs.

• Ozone is a harmful pollutant no matter where it occurs.

• Ozone high in the atmosphere is a pollutant, but near Earth's surface, it provides protection from harmful rays.

• Ozone high in the atmosphere protects Earth's surface from harmful rays, but near Earth's surface, it is a pollutant.

In an area that has high air pollution, you might have seen stone buildings that are damaged, stone statues that are worn down, or cracks in the asphalt in a driveway. Or maybe you see plants that are dying for no apparent reason. You might be observing the effects of acid precipitation.

Which types of gases most commonly combine with water to form acid precipitation?

• carbon oxides and nitrogen oxides

• 
  carbon oxides and sulfur oxides

• nitrogen oxides and sulfur oxides

• ozone and carbon monoxide

Tags

NGSS.HS-ESS2-5

Carmen lives on a farm in an area far away from the city and surrounded by forests. New families are starting to move into the area, and several of them are also farmers.

Which form of land use is probably least important to Carmen and her family?

• agriculture

• deforestation

• development

• 
  strip mining

Tags

NGSS.MS-ESS3-4