How Is Fire Danger or Risk Now Determined Over Large

How is fire danger or risk now determined over large areas?

A) Visible-light sensors on satellites measure the variable shades between green and brown.
B) Infrared sensors on satellites measure greenness versus average greenness.
C) Forest service personnel collect vegetation samples and analyze their water content.
D) Forest service personnel fly over regions to analyze for dry vegetation.
E) Fire lookout employees scan their region to analyze for dry vegetation.

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