rain containing acids that form in the atmosphere when industrial gas emissions (especially sulfur dioxide and nitrogen oxides) combine with water
largest portion of biosphere, water covers roughly 75% of the globe containing fresh water and marine water
the part of the ocean beneath the photic zone, where light does not penetrate sufficiently for photosynthesis to occur.
lacking sufficient water or rainfall
organisms (plants and animals) that live at or near the bottom of a sea
a community of living organisms of a single major ecological region
part of Earth in which life exists including land, water, and air or atmosphere
A logging practice in which all trees in a stand of forests are cut, leaving just the stumps
desert that occurs where land at high altitudes is surrounded by mountains
a type of forest characterized by cone-bearing, needle-leaved trees
the preservation and careful management of the environment and of natural resources
A biome with four seasons, plants shed leaves in the fall and grow new ones in the spring.
the removal of trees
an arid region with little or no vegetation
the wide part of a river where it nears the sea
formed by glaciers that leave large lakes in long basins
land where grass or grasslike vegetation grows and is the dominant form of plant life
water that fills the cracks and spaces in underground soil and rock layers
a form of oxygen that has three oxygen atoms in each molecule instead of two. protects us from dangerous ultraviolet radiation from the sun
ground that is permanently frozen
Portion of the marine biome that is shallow enough for sunlight to penetrate.
a tropical forest, usually of tall, densely growing, broad-leaved evergreen trees in an area of high annual rainfall.
Hot dry summers and cool dry winters;little rainfall
water that flows over land until it reaches lakes, rivers, or other areas
The northernmost edge of the boreal forest, including species-poor woodland and peat deposits; intergrading with the arctic tundra
tropical forest, savanna, desert, chaparral, temperate grassland, temperate deciduous forest, coniferous forest, tundra
a vast treeless plain in the arctic regions between the ice cap and the tree line
Ecosystems of several types in which vegetation is surrounded by stand water during part of the year