Which feature of a heating curve indicates a change ofn state

C. a horizontal line

Explanation:

Heating curves show the transition of states. Diagonal lines show changes in temperature, while horizontal lines show the changing of states. The diagonal or the inclined lines show the changes in terms of temperature, and the horizontal lines show the changing of states.

+15-35=-20

going in opposite directions

answer a fan shaped mass of sediment deposited at the base of a mountain front do to an abrupt change in stream gradient;