What is the meaning of the word composed in the first paragraph?
Water is needed to sustain practically all life functions on planet Earth. A single drop of this compound is composed of an oxygen atom that shares its electrons with each of the two hydrogen atoms. The cycle starts when precipitation such as rain, snow, sleet, or hail descends from the sky onto the ground. Water not absorbed immediately from the precipitation is known as runoff. The runoff flows across land and collects in groundwater reservoirs, rivers, streams, and oceans. Evaporation takes place when liquid water changes into water vapor, which is a gas. Water vapor returns to the air from surface water and plants. Ultimately, condensation happens when this water vapor cools and changes back into droplets of liquid. In fact, the puffy, cotton clouds that we observe are formed by condensation. When the clouds become heavily laden with liquid droplets, precipitation ensures.
A. To consist of
B. To be uniquely discovered
C. To be set apart
D. To be surprised