elmoDaBostonHarborIsland

__Glace__ Years ago, in a land called Boston something big was coming. By big I mean, bigger than a car, much much bigger, something called a glacier. Her name was Glacy. Inside of her she carried rocks, sand, gravel and other things. The name of the material was till. When Glace came it covered most of North America, even Boston. But that changed over time, for multiple reasons Glace started retreating. When the glacier had completely left, it left great new landscapes. One of the most remarkable feature was the Boston Harbor Islands. The till that the Glace carried was deposited, creating drumlins. As Glace melted the sea level rose, causing the drumlins to become drowned drumlins. The drowned drumlins didn’t stay the same they became victims of erosion.  Erosion has changed the appearance of the islands. Erosion by waves has had a great on the islands. The waves cause impact on the rocks; some rocks have gotten smoother, and rounder. Abrasion is also another factor in erosion by waves. The waves carries sand and sediments which when are impacted by rock causes the rock to get worn down. A beach is also formed by the waves. Sometimes, part of the beach is victim of longshore drift. The waves carries particles from the beach out to the ocean. Over time all these particles pile up creating a spit. A great visual example of this is Cape Cod, which looks like an arm flexing.

Another small factor that has been changing the islands is erosion by wind. Wind carries small particles through the air, medium-sized particles are bounced around, and large particles are rolled and slide through the ground. Larges amount of particles in the same area that have been moved from their original location form sand banks, called loess.

The last big factor is erosion by water, which happens everywhere around us. Moving water is the major agent in this form of erosion. The moving water that carries the particles it finds in its way is called runoff. When water hits soil it forms rills and gullies. Rills are groves in the soil, which are like gullies (except smaller) carry runoff. They grow as erosion impacts them, and only flow after it rains. All these forms of erosion are actually happening RIGHT NOW, everywhere around us. We don’t always notice it, but yet its still there. ·Main Page · My Reflection on George's Island Trip