Why does grass change color ([like this](https://cmkt-image-prd.global.ssl.fastly.net/0.1.0/ps/2380908/300/200/m1/fpc/wm0/wxrvwie8xzvzlw2dniyg2jhyzsicwoorwll4anatfile1gfkfwwgoxdjkbavlnhq-.jpg?1488993632&s=454220f0772472a55fe859a0d8769557)) when you drive over it? What exactly causes that effect?
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