A CHEMICAL COMPOUND THAT NEUTRALIZES OR EFFERVESCES WITH ACIDS

A substance capable of causing cancer in living tissue

THE STATE OR FACT OF BEING LIKELY TO BE HARMED BY A PARTICULAR THING

the determination of the condition of bodies & substances

A surface of contact between two groups of unconformable strata

The uncontrolled expansion of urban areas

A SHORT, MICROSCOPIC, HAIRLIKE VIBRATING STRUCTURE

AN ORGANISM CONSISTING OF A CELL OR CELLS

A microscopic single-celled organism

A quantity having direction as well as magnitude