A teacher mixes two clear liquids in a beaker. White solid particles form in the beaker fall to the bottom. What led the student to the observation that a chemical change took place?.

Part of molten rock at mid-ocean ridges

One way that radioactive waste is treated is by burying it in repositories. the repositories are found only in states with very low populations. true or false? a. trueb. false(also i meant to put high school but it put down middle school instead)

Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction