Escola Secundária de Loulé
Around two thirds of the Earth's surface is covered by water, 97.2% of which is contained in all five oceans. The agglomeration of ice in Antarctica contains about 90% of all the existing drinking water on the planet. The water in the form of steam can be seen in the clouds, contributing to the Earth's albedo.Figure 1 presents the water cycle on Earth.
Figure 1. Earth's water cycle
A satellite that seems to be made of water is Jupiter’s moon Europa. On the surface water is frozen but it is thought to have liquid water beneath it.
Comets also contain some water on their ice. It should be understood that when we talk about ice in the comets we are mostly talking about gases like carbon dioxide in a solid state.
No comments:
Post a Comment