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What generally happens at the center when a gas cloud contracts?

Answer and explanation

Correct answer: Temperature and density increase

Direct answer: Option C is correct. When a large gas cloud contracts under gravity, its particles move closer together. Gravitational potential energy is converted into heat, so the central region becomes hotter. Because the same material occupies less space, its density also increases. The sequence is: gravity causes contraction; particles come closer; pressure and collisions increase; temperature and density rise; a hot, dense central region can develop into a protostar. Option A is wrong because contraction generally raises, not lowers, central temperature. Option B is wrong because seas are surface features of planets and do not form in a contracting stellar gas cloud. Option C correctly states both physical changes. Option D is wrong because forests are biological features that cannot grow in a hot contracting gas cloud. Memory cue: contraction under gravity makes the centre hot and dense.

Related tags

GeographyNebulaContraction

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