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6th Grade Unit 4.4 Human Impact on Ecosystems

Horizontales
The natural process of recycling organic matter, such as leaves and food scraps, into a valuable fertilizer that can enrich soil and plants.
The number and the variety of lifeforms within an ecosystem.
Practices and ways of living and doing business that use natural resources without using them up.
An introduced organism that becomes overpopulated and harms its new environment. These populations adversely affect habitats and bioregions, causing ecological, environmental, and/or economic damage.
Includes several methods of reducing the number of times fields are tilled or plowed in a year.
The addition of harmful substances to the environment.
The practice of planting different crops on the same field in different years or growing seasons.
A practice of tilling that helps channel rainwater so that it does not run straight downhill.
Verticales
Rows of trees planted between fields to "break," or reduce the force of winds that can carry off soil.
A type of land degradation in drylands in which biological productivity is lost due to natural processes or induced by human activities whereby fertile areas become increasingly arid
The purposeful clearing or removal of a forest or stand of trees from land that is then converted to non-forest use. It can involve conversion of forest land to farms, ranches, or urban use. The most concentrated practice of this occurs in tropical rainforests.
The measure of the number of people in a given area.
Refers to long-term shifts in temperatures and weather patterns. These shifts may be natural, but since the 1800s, human activities have been the main driver of climate change, primarily due to the burning of fossil fuels (like coal, oil, and gas) which produces heat-trapping gases.
Flat, steplike areas built on a hillside to hold rainwater and prevent it from running downhill. Crops are planted on the flat tops.