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Most of Earth's history has been


Snowball earth

600-800 million years ago


warmer climate and no ice

External factor

Solar radiation

External factor

Earth's orbit

External factor


Internal Factor

Tectonic activity/land distribution

Internal factor

Atmo comp

External factor

Ocean temp/currents

Internal factor

Human activities


elliptical or not



Chemical weathering

removes co2

Major Greenhouse gases

H20, co2, and o

What is polluted?

air, water, land

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