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technique Word or Phrase:Cropmark  
Definition:Cropmarks appear as light and dark marks in growing and ripening crops. These marks relate to differences in the soil below. For example, parched lines of grass may indicate stone walls. Crops that grow over stone features often ripen more quickly and are shorter than the surrounding crop. This is because there is less moisture in the soil where the wall lies.
Where crops appear to be greener and are taller, they may be growing over features such as pits and ditches where there is more moisture in the soil than the surrounding area.

Many archaeological sites are visible as Cropmarks. They are difficult to spot at ground level so archaeologists carry out aerial surveys to help them see the sites clearly.

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