The answer is "Floating Icebergs" or just "Icebergs" for that matter
Explanation:
To extend those records, paleoclimatologists look for clues in Earth's natural environmental records. Clues about the past climate are buried in sediments at the bottom of the oceans, locked away in coral reefs, frozen in glaciers and ice caps, and preserved in the rings of trees.
Deep beneath the surface, heat and pressure can change sedimentary rock to metamorphic rock.
Hope this helps,
♥<em>A.W.E.<u>S.W.A.N.</u></em>♥