iamishmaelhornberger's+Meadow+Ecosystem

=HOW THE BOSTON HARBOR ISLANDS FORMED= media type="file" key="glacier project2.mov" width="390" height="390" HOW THE BOSTON HARBOR ISLANDS WERE FORMED

In s cience class, we have been learning about the Boston harbor islands. They islands formed by glaciers. When the glaciers came, they carried till and sediment on the bottom and when they couldn’t carry anymore, they formed drumlins in the middle of what is now the Boston h arbor.

When the glacier melted it formed a harbor, drowning the drumlins making a drowned drumlin field. All these are what we now know as the Boston harbor i slands.

Now days, many forces help change the shape of the island. The most prominent ones are wind, water and wave erosion. Wind carries sediment and loess around changing the island a little. Water, mostly rain, hits the island changing the island. This can, not only change dirt and sediment but also erode rocks.

The third force is wave erosion. This is the most powerful. When waves hit the side or the island it can change the landform tremendously. Also when waves pick up and carry small rocks and pebbles it can erode by impact. Another thing this could do is to cause the pebbles to scratch other things in a process called abrasion.

Finally a thing that helps change the shape of an island is current and long shore drift. These can carry pieces of sand and sediment down the beach making the far end bigger and the close one smaller.

Works Cited "Ireland." //Sailpolaris Home Page//. Web. 22 Nov. 2011. . "Save the Glacier........" //Stuff in the Air. The Science of Meteorology Online.// Web. 22 Nov. 2011. .