Assertion: coral | /r/Desires | light
Facets:
value: from the sun
type: OTHER
Source sentences:
text: Major threats to coral reefs are water pollution (from sewage and agricultural runoff), dredging off the coast, careless collecting of coral specimens, and sedimentation (when silt or sand from construction or mining projects muddies the waters of a reef and kills coral, which needs light to live).
text: Coral can not grow if the water is too deep (150 metres or more) because it needs light from the sun.