What makes a mountain?

Monday, October 3, 2016 by Evan

If you’ve ever been to Acadia National Park you’ve probably been to the top of Cadillac Mountain, the highest point in the park at 1,527 feet. What you probably didn’t realize is that giant chunk of granite used to be miles and miles below the earth’s surface!

I went to the park this past weekend with my brother, and we eventually found ourselves at the top of this very mountain. Up there we learned that Cadillac Mountain is made mostly of a rock called granite. Granite, we later found out, is a type igneous rock, which means that it formed from the cooling of magma. The Cadillac Mountain granite formed around 420 million years ago, when magma from the earth’s core pushed itself part of the way up through the earth’s crust, where it then cooled into a big blob of granite. Over the next couple hundred million years, the softer rock miles above our granite blob eroded away, bringing Cadillac Mountain to the point where it is today!

If you want to learn more about the rocks in Acadia, check out this article by the National Park Service: https://www.nps.gov/articles/Written-in-Acadias-Rocks.htm



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