THE STEEP DESCENT OF THE SEABED

NUTRIENTS IN A LAKE OR OTHER BODY'S OF WATER

ALLOWING LIQUID OR GAS TO PASS THROUGH

ACID THAT TURNS LITMUS BLUE TYPICALLY

A SUBSTANCE CAPABLE OF CAUSING CANCER IN LIVING TISSUE.

EQUAL NUMBER OF PROTONS DIFFERENT NEUTRONS

POWER OR INFLUENCE

The uncontrolled expansion of urban areas.

A BACTERIUM, VIRUS, OR OTHER MICROORGANISM THAT CAUSE DISEASE

CHEMICAL SUBSTANCE THAT CAN CAUSE GENETIC MUTATION