Human Impact on the Environment

Many products are made from trees. Which is the BEST way to manage the use of trees?

• plant a tree each time one is cut down.

• build more lumber mills.

• cut down more trees.

• reduce the amount of recycled paper.

A good practice to help conserve energy is?

• using plastic bags

• letting the water run while brushing teeth.

• using warm water to wash clothes

• turning lights off when not in use.

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Which statement is a harmful effect of clearing rain forest for farmland is?

• it removes valuable habitat for local species

• it provides more land for the farmers.

• provides income for the residents of the area.

• incrases the groundwater levels

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Increased human populations can lead to the depletion of of resources within communities. Compared to other communities, which of these resources is MOST likely to be depleted in desert communities?

• gasoline

• water

• oxygen

• minerals

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It is estimated that half of the 10 million species of organisms on the planet live in the tropical rain forests. Deforestation of the rain forest causes the extinction of as many as 50,000 species per year. Clearing tropical rain forests causes the extinction of many species because

• plants and animals are exposed to high levels of carbon dioxide.

• pollution caused by humans increases the greenhouse effect.

• many unique habitats and ecosystems are being completely destroyed.

• destruction of the rainforest contributes to the depletion of the ozone.

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1. What would Earth be like without the greenhouse effect?

• The same temperature

• a little cooler than it is now

• . Too cold to live

• a little warmer than it is now

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What is global warming

• the normal temperature fluctuations of Earth's climate cycle

• the melting of the polar ice caps

• the trend of increasing temperatures on Earth

• the changes in Earth's biosphere that affect the atmosphere

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What is the greenhouse effect?

• the burning of fossil fuels causes gases to mix with water in the atmosphere
• ground level ozone and vehicle exhaust react in the presence of sunlight
• certain gases such as carbon dioxide act like a blanket and keep the sun's energy close to earth

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Which is a cause of climate change?

• melting of sea ice
• cutting down trees
• severe storms 
• changes in plant life 

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Which is an effect of climate change?

• melting of sea ice 
• burning of fossil fuels
• cutting down trees 
• vehicle exhaust

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