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These are ripple marks in beach sand, made by the wind. Similar ripples can be seen in deserts, and even in large playground sandboxes. What causes the ripples to be so evenly spaced?


I took this photo near the entrance to Arches National Park. What geologic structure shaped the rocks of this park?


This is Carlsbad Caverns. What are the main chemicals involved in the formation of all of those beautiful, flowstone structures?


Many of the bluffs here have layers of sandstone that tilt up and down at different angles. What caused that?


Nancy and I found these geologic wonders in a dry stream on our way to Bryce Canyon. What are they?


One of the beautiful parts of the landscape in Utah and Arizona is the way erosion shapes the land. Looking at the buttes and mesas, we can see that the entire area was once covered with quite a bit of rock. Most of it has eroded away, leaving the eroding buttes and mesas to tell the story. Is this a butte or a mesa?


I took this photo during a visit to Bryce Canyon National Park. What special erosional conditions formed these amazing rock structures?


Just looking at this boulder-strewn landscape can tell a geologist what kind of rock the boulders are made of, and how they got there. Can you tell the same thing?