Thomas went to Costa Rica ____ he wanted to see a volcano. ____ I have read about volcanoes, I haven't seen one. Thomas showed us his photographs ____ he returned from his trip. ____ she is a park ranger at Denali National Park, Aunt Mary can tell us about glaciers. Glaciers leave rocks behind ____ they move across the land. ____ we traveled to Alaska last spring, I had never seen a glacier. I saw one of these large sheets of ice ____ our plane landed. I put on a heavy coat ____ it is cold on top of a glacier. ____ there once were many glaciers in America, there are few today. ____ some glaciers contain a lot of air, they can look blue. We heard loud noises ____ pieces of a glacier broke off.

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