Glacier Lesson Worksheet



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Glacier Worksheet

Provide a brief answer to each of the questions below based on the images.

|[pic] |Question 1 |

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| |This view is looking up, over the toe of Carbon Glacier toward the peak of Mount Rainier in |

| |Washington. Why do you think there are rocks on top of the glacier? How did they get there? |

| |As the glacial ice moves, it scrapes and grinds the bedrock, and these loosened material |

| |become mixed into the ice. At the toe of the glacier, the ice melts, leaving the rock behind.|

| |This is called a moraine or till. |

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|[pic] |Question 2 |

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| |This is a picture of the beach near Montauk Point on Long Island (at the eastern end of Long |

| |Island, New York). Usually rocks on a beach are well rounded by wave action. These are not. |

| |Where could they have come from? |

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| |The deposits on Long Island are the deposits of a glacier moraine. The rocks were carried |

| |there by glacial ice and deposited at the terminus of a continental glacier. |

|[pic] |Question 3 |

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| |This valley is in North Cascades National Park in Washington. |

| |What shape is this valley, and what gave it the shape? |

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| |The valley is a U-shaped valley. It was carved by a glacier in the past, the the glacier has |

| |since melted. |

|[pic] |Question 4 |

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| |This rock and wall is at the Cloisters Museum in New York City (on Manhattan Island). What are the "scratches" |

| |called, and how do they form? Why are they in New York City? |

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| |Glaciers once covered the New York City area. The moving ice scraped the bedrock producing glacial groove and |

| |striations. The glaciers that once covered New York have since melted. |

|[pic] |Question 5 |

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| |This picture shows two types of rocks on a mountaintop in northern New Jersey. This is a large boulder of a |

| |layered sandstone (a sedimentary rock) resting on granite bedrock (an igneous rock). Sandstone, like this boulder,|

| |is found on a mountain about 30 miles away. How this boulder might get here? |

| |A continental glacier once covered the northern New Jersey region. As the glacier moved south, the sandstone |

| |boulder was plucked from its bedrock source, and transported by the moving glacial ice to its current location. |

| |The glacier melted, leaving the boulder on the mountaintop. |

|[pic] |Extra Brain Teaser |

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| |This view is looking north along the Hudson River in Southern New York. Although the "Hudson" |

| |is a "River" - early explorers of the region thought that the broad river might be a passage |

| |for boat travel across North America. Although they were disappointed, they did note that the |

| |Hudson River is salty all the way to its headwater regions near Albany, New York (nearly 200 |

| |miles from the ocean). Could you explain why the Hudson River is salty? |

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| |The Hudson River is a Fjord. The valley was partially carved by a southward advancing ice sheet|

| |(or continental glacier). When the glaciers melted, rising sea level flooded the Hudson River |

| |Valley with sea water. |

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