Nitric oxide reacts at high temperature with hydrogen: 2NO + 2H2 → N2 + 2H2O and the following data were collected in four experiment runs. Run 1 Run 2 Run 3 Run 4
Initial conc/ mol. L-1 [H2] 0.122 0.122 0.244 0.488
Initial conc/ mol. L-1 [NO] 0.420 0.210 0.210 0.105
Initial rate/ 10-2 mol. L-1.s-1 13.5 3.39 6.77 3.39

answer; i believe that the correct answer is (a); a large rock being weathered by wind and rain;

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.

it is the most commonly accepted one