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Where did the energy stored in coal originally come from?
AFrom heat trapped inside rocks
BFrom wind trapped in swamps
CFrom sunlight trapped by plants
DFrom water trapped in soil
Answer & Solution
Correct answer: C. From sunlight trapped by plants
1. Coal formed from plants that grew in swamps millions of years ago.
2. Those plants trapped the energy of sunlight by photosynthesis.
3. When they died the stored energy was buried with them.
4. Heat and pressure turned the buried layers into coal, energy and all.
_Source: Siyavula Natural Sciences Grade 7 (CC BY 4.0), Formation of coal_