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Glaciers and Paleoclimate
Terms in this set (5)
How and where do glaciers form, what is needed for their formation?
- glacier = highly compacted snow
-formed Alpine(Mountain) areas b/c of cold temps at high elevation (10,000ft)
the balance between the inputs (accumulation) and the outputs (ablation) of a glacier
eroded bedrock that scrapes against underlying bedrock
How do we know there have been at least 5 major glaciations during Earth history?
1. Geologic evidence: tills, striations, drop stones
2. Geomorphological/sedimentary evidence: ancient shorelines, shifting deposition environments
3. Stable isotope evidence: Oxygen isotopes O^18:O^16 ratio in marine shells records and of ice on surface
4. Ice cores: air bubble and ice chemistry records (CO2, CH4)
Be able to describe Earth's current climate in terms of its recent and geologically ancient past (think in different time scales)
much cooler; still in glacial period; on trend of heating up
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