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You may not recognize it, but this is our planet.
你也許不認識 但那確實就是我們的地球
Little more than a few pieces of rock,colliding as they circle around the Sun.
當體積差不多大的巨石在圍繞太陽轉動時發生碰撞
But these impacts produced immense amounts of heat,
這種沖擊力量是如此猛烈 從而產生了巨大的熱量
as did underground radioactive decay.
這些巖石也給地球帶來了大量的放射性元素
Eventually, when the outer layers of the planet cooled
最終，當地球外層冷卻時
these two powerful sources of heat were trapped in a huge hot core.
這兩種巨大的能量源被捕獲在熾熱的地核里
The center of our planet is around as hot as the surface of the Sun.
地球的中心和太陽的表面一樣熱
This is the source of Earth's vast heat energy.
捕獲在地球內部的
And it was what fueled volcano to this day.
巨大的熱量源至今仍然使火山不斷噴發
Earth's hot core has been continuously releasing unimaginable amounts of heat.
仍然不斷地釋放著令人無法想象的巨大熱量
Even after four and a half billion years,there are still plenty left.
在經歷過45億年后這種熱量還大量存在
Volcanoes are the most obvious examples of the Earth's inner heat in action.
火山是地球內熱活動的最明顯的例子
