Question

the earth looks mostly blue when seen from space. why

Answer 1

the earth looks mostly blue when we seen from space because 71% of earth surface is covered with water. Water reflect sky colour.

Answer 2

Answer:

"The earth looks mostly blue" when seen from space as "seventy five percent or three-fourth of the earth’s surface" is covered with "water".

Explanation:

Generally all of these are oceans which contain salty water. This water is not potable and is hence unfit for human consumption. Water that is "fit for human consumption" is present as groundwater, in rivers, lakes and as glaciers on poles. Since glaciers are frozen, so they also cannot be used .