Which of the following is not a use of nuclear chemistry in industry? leak detectors stimulate plant growth thickness gauges tracers

the answer is the first option

explanation:

just googled it m8. not that hard

lol

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.

if you mean hydrogen and oxygen then water is the product