One method of producing hydrogen peroxide is to add strontium peroxide to water. A precipitate of strontium oxide forms, which may then be filtered off to leave a solution of hydrogen peroxide. Write the word equation, symbolic equation and balance the equation.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

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.

a corroding iron, if that's one of your choices