most abundant gas in Earth's atmosphere, Nitrogen, clear gaseous form of water, water vapor, harmful radiation from the sun, UV or ultraviolet, attractive pull force, gravity, layers of gases that surround the Earth, atmosphere, can reflect solar energy away from Earth, clouds, cycle of rocks and soils impacted by the atmos., lithosphere, altitude, height above sea level, high altitude, low air pressure, low altitude, high air pressure, Nitrogen holds this together in all living things, genetic material found in all biotic factors, biotic factor, living thing, second most abundant gas in the atmos., oxygen

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