Page 85 - DK Children's Encyclopedia

Earth SEE ALSO

▸ ▸ Atmosphere p.33
▸ ▸ Earth’s surface
Earth is the planet we live on. It is the third planet away p.84
from the sun and the largest rocky planet in the solar ▸ ▸ Gases p.117
system. Earth is about 4.5 billion years old. At the moment ▸ ▸ Water pp.120–121

it is the only planet known to support life. ▸ ▸ Solar system
p.233

▸ ▸ Sun p.247
Earth has seven
large land masses
called continents. After seeing the
Our home first pictures from
space, scientists
Earth has all the right nicknamed Earth
conditions for life. It is just “the blue marble.”
the right distance from
the sun, it has oceans
of liquid water, and a
blanket of gases called
an atmosphere that
protects it from
outer space.

Earth’s atmosphere
is mostly made of
two gases, nitrogen
and oxygen.

About
70 percent
of the Earth’s
surface is
covered in
liquid water.
The white swirls
are clouds. Thick
Habitable patches of white
are storms.

Earthrise
On Earth, we see a
sunrise and a moonrise
as the sun and moon
Too cold Too hot become visible in the sky.
Earth is here When astronauts orbited
Safe zone the moon in 1968, they
Earth orbits the sun in what is known as the saw our own planet
habitable zone (in green), where liquid water rising in the sky.
can exist. Closer to the sun, it is too hot, and
farther away it is too cold.

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