States of matter means the distinct physical forms in which matter can exist, characterized by differences in the arrangement of particles.

The reactivity series of metals is a fundamental concept in chemistry that provides insights into how metals interact with other substances.

Vaccination, a medical process, person is intentionally given a vaccine, contains weakened, killed, or modified form of a microorganism.

Acid rain is a form of environmental pollution in which rainfall or other forms of precipitation become acidic.

A balanced diet includes various components of food essential for maintaining good health and reducing the risk of diet-related diseases.