Earth Science - Tuckey Name:                                             
Moraines of Michigan Activity      / 10 More...                                           

JUST THE FACTS, PLEASE:

NOW THE ANALYSIS:

  1. From the facts presented, circle the terms which best applies to Michigan's moraines.  Briefly explain your choice.
CIRCLE ONE EXPLAIN YOUR CHOICE
SORTED
UNSORTED
  1. There are 5 major processes of erosion: waves, wind, mass movement, streams, and glaciers.  Which two of these processes commonly leave unsorted deposits?  [HINT: Which processes dump many different sizes of sediment in the same place at the same time?  Use your book, if you need to.]

 

  1. For many reasons, mass movements are probably not responsible for Michigan's moraines.  Describe and briefly explain one such reason.

 

Therefore, it seems that GLACIAL ACTIVITY is the only erosion agent capable of creating moraines!

  1. The shorelines of the Great Lakes are obviously each a reflection of the shape of the depression which contains the lake.  What similarity exists between the shape of the moraines on the map and the shape of the shorelines of the Great Lakes?

 

  1. Since there is a strong relationship between these moraines and the Great Lakes shorelines, what conclusion can you reach about which one of the erosion processes that probably created the depression now filled by the Great Lakes?  [HINT:  For two different natural things to have the same shape and not be created by the same process would be an amazing coincidence!]

 

  1. Evidence suggests continental glaciers completely covered the entire Great Lakes region several times, scratching and gouging across many different kinds of bedrock as they moved.  Why would the Great Lakes depressions be more likely to form on more or less resistant bedrock (pick one and explain)?

 

  1. The diagrams below illustrate how a continental glacier would probably move into an area which had previously shaped by stream erosion.

 

  1. When an ice sheet advances, it often does so as a series of individual finger-shaped masses, called ice lobes.  Ice lobes in our area both gouged out depressions and created moraines at their edges.  The shape and size of each lobe can be estimated by the lake shorelines and the moraines it left behind [see illustration].  One ice lobe on the map moved basically from the West, while the other moved more from the West-Northwest.  Label these two ice lobes on the diagram as W and WNW.

  1. Look at all of your ice motion arrows.  Before studying glacial behavior, most people assume that the ice sheet came directly from the north.  Using the map, explain whether or not this is true.

 

  1. Find the moraine ridges left by the Lake Erie ice lobe, which are now West-Southwest (WSW) of the western tip of Lake Erie (note boxed area at south-central map margin).  These moraine ridges did not form at the same time!