Define state of matter

A state or condition in which matter exists; a material state or condition as opposed to a spiritual one; (Physics) each of the different modes in which matter can exist, traditionally categorized as solid, liquid, and gas, but extended from the 19th century onwards to other states, such as colloids and plasmas. Hope this helps.

answer; /// i do believe that the correct answer is (a) boiling

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.