Examlex
Amphetamine was first used during WWII to keep soldiers alert during battles.
Carbon Cycle
The biogeochemical cycle through which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and is absorbed by plants in photosynthesis.
Terrestrial Plants
Terrestrial plants are species that grow on land rather than in water, adapting to a variety of habitats from forests to deserts.
Aquifer
Rock layers that contain water and release it in appreciable quantities to wells or springs.
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