First Children Encyclopedia

(Marvins-Underground-K-12) #1

Our planet


The Pacific Ocean. It covers nearly half of the Earth’s surface.^247


What’s it made of?


The Earth is made up


of an outer thin crust.


Under this is molten


rock. In the middle


is a solid core.


The crust
The Earth’s crust
is cracked into

lots of huge pieces


called plates. The
cracks are called
fault lines.

Mountains and valleys
Most mountains are made
when rocks are pushed
upwards by movements
of the Earth’s crust.
Blowing winds, flowing
rivers, and glaciers wear
away the mountains.

The San Andreas fault,
California, USA

Sedona, Arizona,
south-western USA

Curiosity quiz


Look through the Planet


Earth pages and see if


you can identify each of


the picture clues below.


Become


an expert


6-7 Our world
272-273 Our place
in space
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