2. Earth is our home. It is the fifth largest
planet in the solar system. Its diameter is about
8,000 meter, and the third-closed planet to the
sun.
It is the only planet known to have an atmosphere
containing free oxygen, oceans of water on its
surface and of course life. Waters covers 70% of
Earth’s surface.
Earth atmosphere is made mostly of nitrogen
and has plenty of oxygen for us to breath.
The 4 basic areas of Earth Science study
are : geology, meteorology, oceanology, and astronomy.
