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G6 Mid-Year Science Review
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What is urbanization?
Urbanization is the growth of urban areas caused by people moving into cities.
What causes land degradation?
urbanization, deforestation, poor farming practices (planting the same crop every year)
What is deforestation?
The removal of trees and other vegatation from an area.
What is desertification?
Desertification is the process by which land becomes more desertlike and unable to support life.
What causes desertification?
Livestock overgraze an area, removing all plants.
How can we stop soil erosion?
By planting trees and shrubs, the roots will anchor the soil in place.
What causes nutrient depletion?
Farmers keep growing the same crop every year.
What is soil erosion?
Soil erosion is the process by which wind, water, and gravity move soil from one place to another.
Describe the nutrient cycle.
Organic mater is broken down by decomposers into nutrients. Plants take up the nutrients. When animals and plants die, they become organic matter.
What are three of the 5 different ways land is used?
recreational, transport, agricultural, resident, commercial/industrial
Describe how acid rain forms.
Burning fossil fuels release carbon into the air. The carbon combines with the water in the cloud to form an acid. It then rains acid rain.
Describe artificial eutrophication.
Human activity increases the nutrients in water. The nutrients cause an overgrowth of algae that reduces the oxygen in the water.
Which type of water pollution is caused by dead organisms in the water?
biological pollution
Which type of water pollution is caused by pesticides, herbicides, and fertilizers?
chemical pollution
What is water pollution?
Water pollution happens when waste or other materials is added to water so that it is harmful to organisms that live in it.
What is a one-point source pollution.
Pollution that comes from one specific place.
What is water quality?
Water quality is measured by how clean or polluted it is.
Why is water important?
It is vital for life.
What are natural resources?
A natural resource is any natural material that is used by humans.
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