Choose the correct variant.

1) The sun’s heat (evaporates / takes / precipitates) water from the oceans.

2) The water rises as invisible (liquid / moisture / vapor), and falls back to the earth as rain, snow, or some other form of (moisture / droplets / fog) which is called precipitation.

3) Most (drop / evaporation / precipitation) drops back directly into the oceans.

4) The unending circulation of the earth’s waters is called (hydrology / the water cycle / evapotranspiration).

5) At one time or another, all the water on earth enters the air, or (ocean / atmosphere / cloud), as water vapor.

6) As the air cools, the vapor (discharges / dew points / condenses) into droplets of liquid water, forming (rain / clouds / hydrologic cycle).