Human Impact

1. What are renewable resources?

• . Resources that are used faster than they form

• resources that can replenish themselves over time

• resources that formed over millions of years

• resources that exist only in rural areas

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

The presence of wastes, such as plastic bags and motor oil, in lakes and streams miles away from developed areas suggests that

• . ecosystems are interconnected and human action can alter ecosystem equilibrium.
• recycling programs have failed to conserve biotic resources.
  
• natural processes can alter ecosystem stability.
•  direct harvesting practices have led to irreversible destruction of ecosystems.

The diagram shows the carbon cycle.  If many trees are removed from a forest by logging, what is the most immediate effect on the carbon cycle in that forest?

•  increase in the rates of decomposition
• increase in the rates of atmospheric carbon dioxide
• decreased combustion of fossil fuel
•  increase production of organic compounds

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

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

The threat to biodiversity that occurs when the homes of different species are destroyed

• pollution

• habitat destruction

• overexploitation

• climate change

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

The largest threat to biodiversity is

• bacteria

• fungi

• humans

• plants

Why are fossil fuels a nonrenewable resource? 

• they take millions of years to replace 
• they can be used over and over again
• they are used to heat and light homes 
• they cause air and water pollution