Home can use to distribute warm air from a sunroom

Solarpannels? I honestly don't know I'm just trying to be helpful.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation:

the answer is barium and copper bromide