Cenozoic Glaciation

Question 1

what is the end Paleocene Thermal Maximum

Answer 1

warmest time in the Cenozoic
sea became very warm briefly

Question 2

What were the Eocene-Miocene cooling

Answer 2

caused the Tethys sea to close
-cooling of surface waters in high southern latituesWhat

Question 3

What is Modern Glaciation

Answer 3

Formation of continental ice sheets in northern hemisphere by 2.6 million years ago
(at least 20 war-cold cycles)

Question 4

how do glaciers form

Answer 4

Glaciers are moving bodies of ice on land
-they move due to internal deformation of ice because of pressure
-and sliding over underlying surface

Question 5

What is the evidence for Glaciation

Answer 5

-pollen
- till
-erratic boulders
- scouring
- glacial lakes
- Isostasy
- sea level changes
- marine sediments and fossils

Question 6

What are the 2 main ways lakes form

Answer 6

1. Pluvial Lakes
2. Proglacial Lakes

Question 7

What are Pluvial Lakes

Answer 7

• large lakes far from glaciers
• form from increased precipitation

Question 8

What are Proglacial Lakes

Answer 8

• Large lakes next to glaciers
• Formed by meltwater ponding

Question 9

how were the Great lakes formed

Answer 9

four of five Great Lake basins were eroded below sea level

as the glacial ice retreated the lake basins began filling with meltwater

Question 10

What caused the overall glaciation

Answer 10

Combination of plate movements, orogenies, and changes in sea level caused long term climatic changes on continents