Week Three- Glaciers- Kaleen Harriga

Week Three- Glaciers- Kaleen Harrigan 

During the Ice Age 30 percent of Pennsylvania was covered in Glaciers, but they left about 22,000 years ago. One of the biggest mountains it left in their absents, was the Appalachian Mountains. It stretches through 16 states and all the way up into Canada, about 1,500 miles long. This was an alpine glacier, which begin high up in the mountains. 

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The Appalachian Mountains where once as tall as the Rocky Mountains, but over the past 100 million years has carved them down to a lower range. There are two main ridges: the Blue ridge and the Valley and Ridge which are both very narrow and rocky. The tops of these are covered in jagged sandstone. The valleys are mainly made of siltstone and shales, which makes them easier to erode than the ridges. There is now a lush forest throughout the mountains, beautiful for hiking. This is was drove me to visit here. This is one of the oldest mountains in the world. The rocks that can be seen are a mixture of marine sedimentary rocks, volcanic basaltic rocks and pieces of the ocean floor. The more research I did on this mountain the more interesting I found how it was formed, slowly and beautifully.