1. Erosion On The Boston Harbor Islands Glacier, Wave, Wind and Water Erosion By: purpleluvr1

2. Glacier Erosion Erosion can be caused by many different things, including glaciers. Glaciers are any large mass of ice that moves slowly over land.

3. Till When a glacier starts to melt, it drops everything that it had picked up along the way. The particles that the glacier drops are called till. Till can contain clay, silt, sand and boulders

4. Drumlins There are two kinds of drumlins, a drowned drumlin, and then just a normal drumlin. A drumlin is a long mound of till that is smoothed in the direction of the glacier’s flow. A drowned drumlin is a drumlin that gets drowned by water, and then turns into something like an island.

5. Moraine A moraine is made up of a mixture of particles of different sizes. Moraines form where glaciers deposit a pile of till.

6. Kettles Kettles form when depressions left in till by melting ice fills with water.

7. Erratic An erratic is a rock or boulder that is different from it’s surrounding rock, and that has been brought there because of glaciers.

8. Erosion By Waves One of the many ways the Boston Harbor Islands were formed was by wave erosion.

9. When a wave hits a piece of land again and again, this is called impact, Impact can cause a lot of changes to a landform. When a wave picks up sand and other things from the bottom of the ocean, it then brings it forward and it hits against land, wearing down rock. This is called abrasion.

10. Deposition and Beaches When a wave picks up sand and other things and then drops it, this is called deposition. This sand is usually deposited on beaches, and beaches are formed by wave-washed sediment.

11. Longshore Drifts And Spits When beach sediment moves down the beach because of the current, this makes the process called a longshore drift. Because of this process, another thing can be formed. A spit. A spit is like a beach that projects out into the water.

12. Erosion by Wind Wind is another one of the things that helped and also helps to form the Boston Harbor Islands. Although wind is one of weakest forms of erosion, it can cause a lot of things for land that has sand.

13. Loess When the wind carries sediment into the air, it always goes somewhere. Where it ends up isn’t always where it belongs. And that is what loess is.

14. Erosion by Water Water is the last way to cause erosion. Erosion by water can be one of the ways that takes the longest to make a landform change, but after a while, there is a change.

15. Runoff When it rains, the water loosens the soil and some other things, and it carries these particles to other places. This is called runoff.

16. Rills and Gullies When runoff travels, it leaves little grooves in the soil, just like when you walk you leave footprints. These tiny grooves are called rills. These rills can grow bigger when they flow into eachother, and that forms gullies.

17. Boston Harbor Islands These are all the forms of erosion, and this erosion helped to create the Boston Harbor Islands a lot of more things and places. Even though it may take thousands of years for there to be big changes, the result is always something amazing and different from what it started off like.