Practice question · Multiple choice
A parched cropmark and a lush green one appear side by side in one field. Why do buried features produce opposite signals in the same drought?
Hints
- Ask what lies under each kind of mark.
- What does a crop do when it has more water than its neighbours?
Show the answer
C. Because a buried ditch holds damp fill and stone leaves it dry
Why
The crop is a moisture gauge. A ditch stores water and a wall steals it, so one feature makes the crop thrive and the other makes it fail, in the same field on the same day.
Practise Remote Sensing and Geophysics
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