Solids have a definite,fixed shape.. So option B which is the second checkbox ☑️ is the correct answer... l hope it helped :)
A substance in the air which can change the surface of limestone would be oxygen, O2.
Answer: An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom. Alpha particles (also termed alpha radiation or alpha rays) was the first nuclear radiation to be discovered, beta particles and gamma rays were identified soon after.
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Minerals and rocks are the same aggregates of minnerals form rocks . Minerals determines the mixture of a rock . most rocks are made of a single mineral type .
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