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 ,

atmosphere 1

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