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18 Cards in this Set
- Front
- Back
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When bacteria decay in water, what gas is removed from the water?
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oxygen
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What is contour farming?
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In contour farming, land is plowed across the slope rather than up and down the slope
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What does the word "toxic" mean?
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poisonous
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Unwanted or harmful substances that are dumped in the environment are called.....
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pollution
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What is nuclear fission?
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the splitting of uranium atoms to release the energy in them
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What is conservation?
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the wise use of natural resources
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Bottles and cans that are thrown or disposed in an improper way in the environment are called....
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litter
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What may cause acid rain?
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emission of sulfur and nitrogen compounds into the air
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What do you call the energy source that comes from heat within the earth?
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geothermal
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What do we call the process by which a species passes out of existence?
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extinction
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What is release of heat into the environment known as?
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thermal pollution
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What is a temperature inversion?
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a layer of cool air is trapped beneath a layer of warmer air
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What is erosion?
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the carrying away of soil by water
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What do we mean by nonrenewable resource? Name 2 nonrenewable resources.
What do we mean by renewable resource? Name 1 renewable resource |
nonrenewable-- no more of it will be made in our lifetimes... oil, gas, coal
renewable-- can be remade..... water |
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What is crop rotation?
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Planting different crops every year on the same land.
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What is the rich upper layer of the soil called?
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topsoil
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What happens if you plant one type of crop on the same soil for too long?
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the nutrients in the soil are depleted
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What are the fossil fuels?
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coal, oil, gas
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