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the rover itself. you can see the instruments we have been to before. i want to skip to the next one. what you can see is where we land and the images that dawn was showing. this is called a luvial fan. we think water was running along and moving sediment particles. we do not know how this is formed. it looks very special. it is one of the things that uniquely goes with the site. then we can drive out and go out to where it says clays, which is one of the minerals that is formed with water. that patch of green is a place that we would study. then we would go to where it says sulfates, another kind of mineral. we are exploring a geological environments that consists of a stack of layers that tells about the environment. when we skip to the next one, why do these layers matter? this is the history of geological exploration on earth. 150 years ago, when the first explorers went down the colorado river and discovered the grand canyon, they discovered all of these layers ....

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