What’s the answer to the bottom half

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.

As a small change in a person's dna can cause a genetic disorder

Based on the topographic map of mt. st. helens, what is the contour interval of the volcano about height is 2,950 m?