Page 52 - DK Children's Encyclopedia
P. 52
The story of...
Changing world Earth is born
Our planet was formed
when rocks orbiting the sun
Since it formed, the Earth has been crashed into each other and
covered with molten lava, bombarded stuck together. The early Earth
had a poisonous atmosphere
by rocks from space, and blanketed and a volcanic landscape
in ice. In 4.5 billion years, the with lots of craters.
Earth has changed from a hot,
lifeless planet into a watery
home, full of life. The formation
of the Earth
Mountains are
created when
On the move continents
Earth’s land is split up into move and hit
huge chunks called continents. each other.
Throughout Earth’s history, the
continents have shifted around.
Today, there are seven
continents, but they have
not always looked the way
they do today.
The continents were
grouped together in
a “supercontinent”
called Pangaea.
250 million years ago
Marrella, a life form from
540 million years ago.
Life begins
At first, nothing lived on
Earth. The earliest life
forms appeared 4,600 million 120 million years ago
years ago. Over time, more
species developed. Now there
are millions of different Pangaea split in two, forming
types of life, and over Laurasia in the north and
Gondwana in the south.
7.5 billion people.
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