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finish up the tense change in the defining sentence
An '''Ice Age''' is when the [[earth]]'s average [[temperature]] drops so much that [[glacier]]s extended into what we think of as [[temperate]] zones and sea levels recede due to the loss of water to the ice.
An '''Ice Age''' is when the [[earth]]'s average [[temperature]] drops so much that [[glacier]]s extends into what we think of as [[temperate]] zones and sea levels recede due to the loss of water to the ice.
== Secular Geology's Perspective ==
== Secular Geology's Perspective ==