ABYSSAL ZONE - THE BOTTOM OF A SEA OR OCEAN

DEFINITION-is a word that comes to us through physics, where cohesion describes particles that are the same and tend to stick together water molecules, for example

DEFINITION-A SYSTEM OF METHODS USED IN A PARTICULAR AREA OF STUDY.

DEFINITION- A SYSTEM OF INTERLOCKING AND INTERDEPENDENT FOOD CHAINS.

DEFINITION-BIOLOGICAL INDICATORS ARE SPECIES USED TO MONITOR THE HEALTH OF AN ENVIRONMENT OR ECOSYSTEM.

DEFINITION-THE DRAINING AWAY OF WATER (OR SUBSTANCES CARRIED IN IT) FROM THE SURFACE OF AN AREA OF LAND,

DEFINITON-MUDDINESS CREATED BY STIRRING UP SEDIMENT OR HAVING FOREIGN PARTICLES SUSPENDED.

DEFINITION-A SUBSTANCE CAPABLE OF CAUSING CANCER IN LIVING TISSUE.

DEFINITION-IN·DEX FOS·SIL FOSSIL FROM ONE GEOLOGIC AGE: THE FOSSIL OF AN ORGANISM THAT IS SPECIFIC TO A PARTICULAR GEOLOGIC AGE AND IS USED FOR DATING OR IDENTIFYING ROCKS OR ROCK LAYERS IN WHICH IT IS FOUND