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rain containing sulfuric acids
underwater ecosystems *
permanently dark layer of the oceans below the photic zone
having insufficient rainfall to support agriculture *
organisms that live attached to or near the ocean floor
group of ecosystems that have the same climate and dominant communities
part of earth in which life exists including land, water, and air or atmosphere
cutting all the trees in an area down at once *
A desert that is low in temperature
forest populated by cone-bearing evergreen trees
wise management of natural resources, including the preservation of habitats and wildlife
a type of forest characterized by trees that seasonally shed their leaves
destruction of forests
dry land with little or no vegetation
wetlands formed where rivers meet the ocean
A lake that gets much or all of its water from the melting of glacier ice.
a large area of land covered with grasses.
water that fills the cracks and spaces in underground soil and rock layers
atmosphereic layer in which ozone gas is relatively concentrated
layer of permanently frozen subsoil in the tundra
well-lit upper layer of the oceans
a forest with heavy annual rainfall
very dry with little rainfall
Water flowing off the land into bodies of surface water. See reliable runoff.
biome in which the winters are cold but summer are mild enough to allow the ground to thaw
Biomes on land (forests, taiga, tundra, etc.)
a vast treeless plain in the arctic regions between the ice cap and the tree line
ecosystem in which water either covers the soil or is present at or near the surface of the soil for at least part of the year