Assignment 3 Riddles of Sand and Ice Answer

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Homework #2

  1. How did people originally explain the huge out-of-place stones (erratics)? How are they actually explained?

 

  1. How deep was the ice over midtown Manhattan?

 

  1. How many tons of ice are found on Greenland?

 

  1. If all the ice vanished from Greenland, what would it look like?

 

  1. What is the source of the Mendenhall Glacier?

 

  1. What is a nunatak?

 

  1. What is firn?

 

  1. How do the ice crystals change in a glacier as they get buried deeper and deeper?

 

  1. What are terminal moraines? How are they formed?

 

  1. What do giant boulders on the Mendenhall Glacier tell us about erratics in New York or Alberta?

 

  1. What do the jagged stones at the bottom of a glacier do?

 

  1. How do glaciers move? What happens to the snout of the glacier when it reaches the sea?

 

  1. What do the gouges and grooves on the bedrock of Central Park tell us?

 

  1. How were the Finger Lakes formed?

 

  1. Based on the compass directions of the grooves, what was the source of the ice sheets that covered eastern North America?

 

  1. What is the shape of most glacial valleys?

 

  1. Describe the changes in the movements of the earth around the sun, and its tilt (Milankovitch cycles).

 

  1. What triggers an ice age: cold winters or cold summers?

 

  1. What is the albedo effect?

 

  1. How do the Gulf Stream and the Arctic air interact and trigger an ice age during cool summers?

 

  1. At the peak of the last ice age, how much of the earth was covered by ice? How many ice ages have occurred in the last million years?

 

  1. What does the ice age do to the Sahara Desert?

 

  1. What did satellite observation show beneath the Sahara Desert?

 

  1. What do the ancient rock images show?

 

  1. What does the expansion and retreat of polar ice sheets do to the dry belts over the Sahara?

 

  1. How does continental drift explain the giant petrified logs from 100 m.y. ago?

 

  1. How has Lake Chad changed? How does it impact the people?

 

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Assignment 3 Riddles of Sand and Ice Answer

 

  1. How did people originally explain the huge out-of-place stones (erratics)? How are they actually explained?

Answer: The people originally explain that the huge out-of-place stones (erratics) were the remnants of the Great Flood. However, by the 19th century, the scientists proposed that these erratics were transported by the glacier ice.

  1. How deep was the ice over midtown Manhattan?

Answer: 300 feet thick

  1. How many tons of ice are found on Greenland?

Answer: 2,400 trillion tons

This question is taken from GSC 3200 – Studies of a Blue Planet » Fall 2021 » Assignments