Widely spaced contour lines indicate a a. steep slope c. hill b. gentle slope d. river

The right option is; b. gentle slope  

Widely spaced contour lines indicate a gentle slope .

A contour line is a line that connects points of the same height (elevation) above a specific level. Contour lines are drawn on topographical maps to indicate the elevation of a land along the line. Based on the elevation changes of a land, contour lines may be widely spaced which indicate a gentle slope or it may be packed closely together which indicate steep slopes.

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes