How had/has human activity influenced the tropic cascade of the aleutian islands kelp forest

Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

What are chlorofluorocarbons made of

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is