NH3(g) --> NH3(1)
endothermic or exothermic?

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:

we need the questions , i may then you.

2b2t

explanation:

2b2t

level 4 to level 2 : ))