Earth's Climate Long Ago

How Do We Know What Earth's Climate Was Like Long Ago_
Clues about the past climate are buried in sediments at the bottom of the oceans and lakes, locked away in coral reefs, frozen in glaciers and ice caps, and preserved in the rings of treesTo extend those records, paleoclimatologists look for clues in Earth's natural environmental records
For example, scientists can study what Earth's climate was like hundreds of years ago by studying the insides of trees that have been alive since then. But if scientists want to know what Earth's climate was like hundreds of thousands to millions of years ago, they study sediment cores and ice cores.

We Asked a NASA Scientist.

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