Over geologic time the earth's climate has been changed by

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All of these factors have contributed to changes in the earth's climate over geologic time. The sun's energy output can vary over time, affecting the amount of solar radiation that reaches the earth's surface. Large meteoric impacts can cause a temporary cooling effect by throwing up dust and other debris into the atmosphere. Earth's orbit around the sun can change over time, causing variations in the amount of solar radiation received by the planet. Ultimately, all of these factors have played a role in shaping the earth's climate over millions of years.

Over Geologic Time the Earth's Climate Has Been Changed by