Reporters saw pottery, coins are round hole, lime-soil color, such as the present one dollar coin size, money, Xiao Zhuan "five baht words" clearly visible.

记者看到陶币为圆形方孔，灰土色，如现在的一元硬币大小，钱文小篆“五铢”字样清晰可见。

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The color of soil depends on many things.

土壤的颜色取决于很多因素。

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Among them: flowerpots whose color warns when the soil is drying out, blackboards using water instead of chalk that could be erased by a pulse of heat, and even cars that change color in the rain.

其中包括：当土壤正在变干之时，凭颜色发出警告的花盆；用水笔代替粉笔写字，用热脉冲可以擦除字迹的黑板；甚至包括在雨中变化颜色的汽车。

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The software makes estimates on acres planted and projected yields by analyzing the soil color, how green the crop is and the rate at which the color changes.

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The entire village is washed in rich sunburnt shades of ochre, (a natural dye taken from the local soil, no other color is allowed for buildings).

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Barns, rooftops and furrowed earth are reduced to broad geometric planes of color in "Red Soil" (1924) by Oscar Bluemner.

WSJ: Nature in America | A Landscape in Evolution | By Barrymore Laurence Scherer