Name: 你需要知道的關於地球的一切 (Everything You Need to Know About Planet Earth)
Uploaded: 2021-01-14T05:21:41.000Z
Duration: 7 min 22 s

Planet Earth is the home of every lifeform,

Its age is about 1/3 of the age of the universe

地球年齡大約是宇宙的三分之一

a slightly squashed fair with a heavy metal core,

受到稍微均勻擠壓的地心，充斥著重金屬

wrapped in a thin sliver of sweet air to breathe,

以一層薄薄的甜美空氣包覆著呼吸

fresh water rivers, streams, lakes and aquifers,

清澈的淡水河流、小溪、湖泊、地下水

環繞著一顆提供我們溫暖的恆星

But how did our home come in to existence,

但是到底我們的家鄉地球是怎麼出現的呢？

Earth was created from the remnants of dead stars,

地球從死亡恆星的星雲中孕育而生

that collected in a giant, dirty gas cloud.

聚集成一團巨大且骯髒的氣體雲

The gas cloud became denser in its center,

氣體雲的中心內部變得越來越高密度

small particles started clumping together,

until they form the objects we call "Planets" today.

進而形成一個我們今天所謂的「星球」

This process took 10 to 20 million years,

這個過程歷時十年到兩千萬年的時間

At about this time, when the solar system was young and chaotic,

差不多在那時候，太陽系還是相當年輕且混亂

一個巨大的物體，大概和火星一樣大

而且如果當時的那個物體再大一點的話

Materials from Earth were smashed out into orbit,

撞擊出來的地球物質在特定軌道上運行

which is the biggest satellite in relation to its planet in the solar system.

But something was about to change drastically.

wandered to the surface and rained down on Earth,

only to vaporize again and become clouds.

Millions of asteroids brought more and more water to our planet.

數百萬的小行星帶給地球越來越多的水

All the water on Earth has about this volume compared to Earth.

地球上所有的水相較於地球體積大概是這樣

and only about 1% make up the remaining ground waters.

But even this small part is mostly frozen.

但是雖然在這一小部分裡面大部分都是冰凍的水

Only a tiny part of our water is actually lakes and rivers.

我們的水裡面只有一小部分是湖泊或河流

and an even tinier part is bound in living things.

而那微小的一部分卻與萬物生存息息相關

But inside the earth, hot rock continue to swirl about,

但在地球內部，熾熱的岩石依然在對流

moving the crust from below and breaking it apart.

在地殼下流動並將地殼分成數塊

This process is called "Plate Tectonics",

We'll make a whole video about it in the future.

我們會再針對這個主題製作一個影片

let's just say that the crust of Earth consisted of

我們只能說地球的地殼是由數塊

As they meet, they crumble, and create mighty mountains.

當板塊相撞時，它們會擠壓並形成高聳的山

violently plunge back down, deeper into Earth,

猛烈的擠回地球內部、深入地心

That's the way the highest place on Earth was formed: Mt.Everest,

藉由這樣的過程，地球最高點：珠穆朗瑪峰形成

以及最深處：馬里亞納海溝形成

Earth's mountains and trenches are mighty indeed,

地球上的高山或是海溝都很壯觀

but when you look at the Earth in cross-section,

你就會發現其實它們相當的渺小

though it can vary between 5 and 70 kilometers

雖然厚度可能從5公里到70公里都有可能

The mantle consists of the upper mantle, and the lower mantle.

The upper mantle has different regions, too.

It's upper part, which is viscous and carries the crust,

上部地函具有高度黏性並可以帶動地殼

After that, there comes the "Asthenosphere,"

which consists of less mobile, mostly solid material.

主要是由不太流動的固體材料所組成

The lower mantle reaches deep down to the outer core of Earth.

Earth's outer core is a liquid layer of iron and nickel,

Temperatures vary from 4,000℃(7,232℉)

溫度變化從攝氏4000度（華氏7232度）