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B1 中级 英语 3:33 Educational

Earth 101 | National Geographic

National Geographic · 6,751,707 次观看 · 添加于 2 个月前

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00:02

- [Narrator] Earth, the only planet known to maintain life.

00:06

A product of scientific phenomena and sheer chance.

00:10

This blue speck in space holds the past,

00:13

present, and future, of our very existence.

00:17

(instrumental music)

00:19

Approximately 4.5 billion years ago,

00:22

the Earth formed from particles left over

00:24

from the creation of our sun.

00:27

Gravity drew these particles together

00:29

to form pebbles which then formed boulders,

00:31

and eventually, the Earth.

00:34

At its heart is a solid inner core

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