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MOUNTAINS A mountain is a very tall hill. It climbs high into the sky. There are mountains all over the world. The tallest mountain in the world is Mount Everest. It is in Nepal. People climb to its top. It is very cold. The highest mountain in the U.S. is in Alaska. People call it Denali. It is lovely. Mountains are fun to explore. Bears and birds live there. So do trees and plants. Have you ever walked up a mountain?