Give a geographical reason for each of the following:
(i) Earth is a habitable planet.
(ii) From space Earth looks blue.
(iii) Water bodies reduce the day-night temperature variations.

(i) Earth is a habitable planet as it is covered with green vegetation, enormous blue-green oceans containing over a million islands, a large number of streams and rivers, huge land masses called continents with mountains, ice caps and deserts. It also has ideal temperature for the existence of life.

(ii) From space Earth looks blue because 70% of the earth's surface is covered by water.

(iii) Water bodies reduce the day-night temperature variations as water can absorb enormous amounts of heat without causing much change in its temperature. Water bodies rapidly absorb enormous amount of heat during the day, and keep the earth fairly cool. At night, they release the heat absorbed during the day, which along with other atmospheric effects, keep most of the surface from freezing at night.