What is an Ice Age?

Question 1

t/f
sediment from ancient glaciers is well sorted and is made of different bedrock types

Answer 1

false
- POORLY sorted
- but yes- made of different bedrock types

Question 2

During which era was “snowball earth”?

Answer 2

Neoproterozoic

Question 3

When were the predicted first glaciations?

Answer 3

Late Archean
- between mesoarchean and neoarchean?

Question 4

What does LGM mean? When was it?

Answer 4

LGM= last glacial maximum

• it was 25-20ka
• extensive ice sheets

Question 5

ka=

Answer 5

kiloauuum (thousands of years ago)

Question 6

List 9 main ice sheets that were present during the LGM

Answer 6

• Laurentide Ice sheet
• Cordilleran Ice sheet
• Innuitian Ice sheet
• Greenland Ice sheet
• Eurasian Ice Sheet Complex
• Patagonian Ice Sheet
• West Antarctic Ice Sheet
• East Antarctic Ice Sheet
• Himalaya Ice Sheet

Question 7

What does SLE mean?

Answer 7

= sea level equivalent
ie if the glacier melted and that would increase the sea level by 10m, then that glacier has an SLE= 10

Question 8

what is the SLE of the east Antarctic ice sheet?

Answer 8

55m!!!

Question 9

Is the East Antarctic Ice Sheet cold based or warm based?

Answer 9

cold- based (frozen to glacier bed)

Question 10

During the LGM, global sea level was ___m lower than currently

• sea level is a proxy for ___ ____ measurements

Answer 10

120m lower!

ice volume