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:world_map:GEOGRAPHY TERM 1 :world_map: - Coggle Diagram

- - - - DEFINITION - inland waters such as rivers, lakes and wetlands are some of the world's most degraded environments. Human activities have reduced the quality and quantity of clean fresh water in many of these places.
      - DAMMING THE RIVERS - Dams disrupt the flow of water,flooding some areas and stopping water reaching other areas. Damming also disrupts ecosystem services such as the provision of fresh water, fertile soil and food.
      - POLLUTANTS IN OUR WATER - Water pollution is the contamination of our rivers,lakes, wetlands, estuaries, seas and oceans. This pollution can be the result of human activities near the water such as shipping, fishing and oil drilling, or from activities conducted on land, a long way from the waterways.
    - - DEFINITION - The loss of productivity and decline in fertility of land-based environments as a result of human
        activities are referred to as land degradation.
      - SOIL DEGRADATION - refers to the loss of fertility
        of the soil, often due to a chemical change
        it can degrade by becoming compacted by large machinery and hard-hooved animals.
        one of the greatest problems for Australia is the buildup of salt in the topsoil.
      - SOIL EROSION - is when soil is gradually worn away by the natural phenomena such as river, rain,waves,glaciers and the wind. human activities, particularly clearing trees for farming, accelerate erosion in many places.
      - ECOSYSTEM DECLINE - as well as the soils, the natural ecosystems of an area, such as forests and streams, can become degraded. this may be through a loss of vegetation, the invasion of alien plant and animal pests or a decline in the quality of streams and rivers.
    - - DEFINITION - the atmosphere is a layer of gases surrounding the Earth's surface. there are many ways in which we are polluting it for example the greenhouse gases we emit through factories, driving cars and mining fossil fuels.