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By the time the average passenger car tire ends up at the scrap yard, it weighs six pounds less than when it was new. Multiply six pounds by the number of tires scrapped each year in the U.S., and we’re talking over three-quarters of million tons of rubber that perform a disappearing act every year!
You may be wondering how grass on football and baseball fields stays so green, especially with all that heavy traffic. Grass on athletic fields is planted over a layer of sand, which greatly reduces the problem of compaction.
In the desert, the absence of water means little or no chemical weathering can take place. Instead, erosion, frost, sedimentation, and the huge temperature fluctuations between day and night break down the rocky surface into sand or gravel.