Geography 5 at UCLA chapters 5,6, 7 Principles of Environmental Science
Grassland
Desert
Tundra
Conifer Forests
Grassland
Desert
Tundra
Conifer Forests
Desert
Grasslands
Tundra
Conifer Forest
Desert
Grassland
Tundra
Conifer Forest
Bottom sub-community with low oxygen levels
Distinctive temperature transition zone that separates warm upper layer and deeper cold layer
Connects other aquatic ecosystems
Waterlogged soils that tend to accumulate peat
Land surface is saturated or covered with water at least part of the year
Wetlands with trees
Wetlands w/out trees
Dinosaurs and 50% of existing genera disappeared
2/3 of all marine species and early half of all plant and animal families died out
Fossil records suggest more than 99% of all species ever in existence are now extinct
A small percentage of mature trees are taken in each 10-20 year rotations, can retain many characteristics of mature, old growth forests
Harvesting all trees in a narrow corridor
Every tree in a given area is cut regardless of size - fast/efficient but wastes small trees, increases erosion, eliminates wildlife habitat
Iron deficiency
Starch deficiency
Iodine deficiency
Obesity
Planting different crops in alternating strips along land contours
Plowing across slope to slow the flow of water
Shaping land to create level shelves of earth to hold water and soil
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