Triboluminescence is said to be observed on a mineral if the light is emitted after applying pressure or subjecting a mineral to stress. A After subjecting a mineral under electric charges B) After heating a mineral above its melting point D After heating a mineral below its melting point True A basaltic dike cuts across a large bed of Mesozoic sandstone deposits therefore, the dike must be younger than the sandstone bed. A B Either older or younger Neither older nor younger True Older

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