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The bottom layer of the atmosphere. 6 miles high

Montreal Protocol

Treaty/protocol that deals with stopping the production of ozone depleting chemicals

greenhouse effect

Heating of a planet's atmosphere that occurs when outgoing infra-red radiation is trapped by certain gases.

Milankovitch cycles

Changes in the shape earth's orbit and tilt that cause glacial periods and interglacial periods.


a reservoir that uptakes a chemical element or compound from another part of its cycle.


How reflective a surface is.

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