Exanthem refers to a widespread usually found on children. burn bruise skin discoloration rash submit

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate