Water is a liquid at room temperature rather than a gas primarily due to it being a very heavy molecule hydrogen bonding between molecules it being nonpolar a low density.

water is a liquid at room temperature because of the hydrogen bonding between its molecule.

the atomic mass is the bottom number on the element.

-steel jelly

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.