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| Term | Definition |
|---|---|
| Biome | A grouping of ecosystems with similar abiotic and biotic conditions. |
| Climate | The average conditions, including temperature and precipitation, over a long periods in a given area. |
| Weather | The day-to-day conditions in Earth's atmosphere |
| Climatograph | A diagram that shows an area's average temperature and precipitation. |
| Net primary production | The organic matter, or biomass, that remains after cellular respiration. |
| Canopy | The dense covering of trees, 50 to 80 meters above the ground, in a rain forest. |
| Emergent Layer | The few tall trees that extend above the canopy in a rain forest. |
| Understory | The shorter trees and plants found in a tropical rain forest. |
| Epiphytes | A plant that grows on other plants instead of in soil. |
| Deciduous | A tree that loses its leaves and stops during part of the year. |
| Estivation | The deep sleep like state that an animal enters when conditions are dry. |
| Coniferous | A tree bearing cones that typically does not lose its leaves. |
| Hibernation | The deep sleep like state that an animal enters for most of the winter. |
| Permafrost | Permanently frozen soil. |
| Salinity | A measurement of the amount of salts dissolved in water. |
| Photic Zone | The uppermost layer of an aquatic ecosystem, where there is enough sunlight for photosynthesis to occur. |
| Aphotic Zone | The layer below the Photic Zone in an aquatic ecosystem, where no sunlight penetrates so photosynthesis cannot occur. |
| Benthic zone | The bottom layer of an aquatic ecosystem |
| Littoral zone | The shallow near-shore portion of the photic zone. |
| Limnetic zone | The portion of the photic zone that is farther from the shore than the littoral zone; no rooted plants are found in this zone. |
| Wetlands | An area of land that is flooded with water at least sometime during the year. |
| Food plain | An area alongside a river that periodically floods. |
| Estuaries | Body of water, partly enclosed by land, that occurs where fresh water meets the water of an ocean or inland sea. |
| Upwelling | The flow of cold, nutrient-rich water toward the surface of the ocean. |