Impact

Air pollution can contribute to many respiratory problems for people living in or near big cities or industrial areas. Air pollution especially affects people who have emphysema, asthma, and other lung diseases. 
Which of the following is a major contributor to air pollution?

• fossil fuels
• indoor air pollutants
• rain
•  sunlight

Less than 1% of Earth's fresh liquid water is on the surface.

• True
• False

What is the main reason why nonnative species are so successful?

• They don't have any predators.
• They are bigger than the native species.
• They are smarter than the native species.
• They are stronger than the native species.

Humans can cause different types of environmental pollution. Which type of pollution is directly caused by humans dumping the remains of dead organisms into bodies of water? 

• urbanization
• biological pollution
• chemical pollution
• thermal pollution

 
Earth’s surface is mostly water. However, only a small amount of water on Earth is clean freshwater. Why is it important to maintain water quality?

• to keep water from evaporating
• to keep the ocean levels from lowering
• to keep the polar ice caps from melting
• so that people don't get sick

Soil erosion can increase when humans remove trees and other vegetation from an area. What is this process called? 

• urbanization
• deforestation
• decomposition
• conservation

A species that does not occur in an environment naturally is called a(n):

• alien species
• native species
• non-native/invasive species
• natural species
  

Where does the energy that powers the water cycle come from?

• the sun
• electrical outlets
• plants
• animals

A resource that forms at a rate that is much slower than the rate at which it is consumed.

• Nonrenewable Resource
• Renewable Resource
• Natural Resource

A resource that can be replaced at the same rate at which the resource is consumed.

• Nonrenewable Resource
• Renewable Resource
• Natural Resource