W&C Ch.4 Sec.3
... 3. Pollen Records: Find pollen fossils – Tells scientists what types Of plants lived in certain areas many years before. This gives Clues as to what climate was like. 4. Ice Age or Glacial Episode – Cold period in history 4 major ice ages in the last 2 million years They last 100,000 years or more. ...
... 3. Pollen Records: Find pollen fossils – Tells scientists what types Of plants lived in certain areas many years before. This gives Clues as to what climate was like. 4. Ice Age or Glacial Episode – Cold period in history 4 major ice ages in the last 2 million years They last 100,000 years or more. ...
Ice-sheet dynamics
Ice sheet dynamics describe the motion within large bodies of ice, such those currently on Greenland and Antarctica. Ice motion is dominated by the movement of glaciers, whose gravity-driven activity is controlled by two main variable factors: the temperature and strength of their bases. A number of processes alter these two factors, resulting in cyclic surges of activity interspersed with longer periods of inactivity, on both hourly and centennial time scales. Ice-sheet dynamics are of interest in modelling future sea level rise.