Human Impact on Earth

Increased industrialization will most likely

• decrease available habitats 
• increase environmental carrying capacity 
• increase the stability of ecosystems 
• decrease global warming

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1. What is one of the greatest threats to biodiversity on Earth?

• habitat destruction

• loss of drinking water

• decrease in food supply

• pollution

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1. Why might an introduced animal species overrun native species in an ecosystem?

• . Its population size is smaller than those of native species.

• . It is more energy efficient, so it eats less food.

• It is a predator of the native species.

• It often has no natural enemies

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Which of these is one cause of deforestation?

• Urbanization

• Buying a Christmas tree during the holidays

• Overbreeding birds in the wild

• Cutting down the tree in your backyard

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What is deforestation?

• Clearing Earth's forests on a massive scale
• Eating too much vegetables
• Going to a forest and pulling weeds
• Clearing the five trees in my backyard

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When human-made chemicals and garbage find their way into nature and harm the air, soil, and water it is called

• pollution

• habitat destruction

• overexploitation

• climate change

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The largest threat to biodiversity is

• bacteria

• fungi

• humans

• plants

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Most water pollution is the result of

• human activities.
• drought.
• volcanic eruptions.
• storms.

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What is the major cause for air pollution? 

• factories and cars
• cigarretes 
• deforestation
• oil spills

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Approximately 75 percent of the Earth's surface is covered in water. So why is water considered such a precious resource?

• The greenhouse effect is causing most of the world's freshwater to be trapped in the atmosphere
• Only a small fraction of the Earth's water is freshwater available for drinking and irrigation
• Each year, more freshwater is being trapped in icecaps located at the North and South Poles
• Global warming caused by greenhouse gas emissions will likely cause Earth's oceans to evaporate

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