Which is the smallest particle into which water (h2o) in a glass can be broken down and still remain water? a. a water molecule b. only an oxygen atom c. only a hydrogen atom d. a hydrogen peroxide molecule

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.