Classify each statement as an observation, a law, or a theory.
a. All matter is made of tiny, indestructible particles called atoms.
b. When iron rusts in a closed container, the mass of the container and its contents does not change.
c. In chemical reactions, matter is neither created nor destroyed.
d. When a match burns, heat is released

An observation is a statement based on sensory experience or measurement, describing a fact or occurrence without interpretation. For example, 'When a match burns, heat is released' is an observation because it describes a directly perceivable event without explaining why it happens.

A scientific law is a statement that describes a consistent and universal relationship observed in nature, often expressed mathematically. It predicts what happens under certain conditions but does not explain why. For instance, 'In chemical reactions, matter is neither created nor destroyed' is a law, known as the Law of Conservation of Mass.

A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of evidence and multiple observations. It provides the underlying reasons for phenomena. 'All matter is made of tiny, indestructible particles called atoms' is a theory, as it explains the composition and behavior of matter at a fundamental level.