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(75 classifications) (82 resources)

Key Concept Classifications
Abiotic (1)
Arctic tundra (3)
Bacteria (9)
Biodiversity and diversity (56)
Biogeochemical cycle (10)
Biomes (2)
Biosphere (1)
Biotic (2)
Birth rate (1)
Carbon cycle (5)
Carbon dioxide (7)
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Climate (30)
Climate change (27)
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Communities (3)
Conservation (115)
Coral reef (22)
Decomposition (1)
Demography (4)
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Distribution (2)
Ecosystems (71)
El nino (5)
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Evolution (5)
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Fitness (1)
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Invasive species (12)
Life cycles (4)
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Native species (4)
Natural selection (1)
Nitrogen cycle (1)
Permafrost (1)
Photosynthesis (2)
Phytoplankton (1)
Plankton (4)
Pollination (1)
Pollution (48)
Population density (1)
Populations (21)
Predation (2)
Rain forests (1)
Resources (2)
Runoff (4)
Salinity (6)
Savannas (1)
Sociobiology (1)
Soils (4)
Solar radiation (19)
Species richness (5)
Survival (2)
Sustainability (122)
Symbiosis (3)
Tropical rain forests (2)
Water cycle (18)
Wetlands (17)
Wind (1)



Due to the presence of dissolved gases such as carbon dioxide, rainfall is naturally acidic. The release of other gases and chemicals such as sulfur dioxide during the combustion of coal and oil can cause rainfall to...
The American Association for the Advancement of Science is a nonprofit professional society dedicated to the advancement of scientific and technological excellence across all disciplines, and to the public's...
Aquifer basics outlining the makeup of the basin and range aquifers. Description and maps of unconsolidated sand and gravel aquifers. This site consists of information for the Southwestern portion of the United States,...
This site includes a wealth of detailed information on Australian-specific and non-specific mangroves. Information includes coping with salt, zones, flora and associated fauna, history, facts & stats. Links to several...
A collaboration between several Virginia-based, Chesapeake Bay-related organizations, this educational website includes lesson plans, field trips, and student projects and activities. The included lesson plans represent...
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