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You may not recognize it, but this is our planet.
你也许不认识 但那确实就是我们的地球
Little more than a few pieces of rock,colliding as they circle around the Sun.
当体积差不多大的巨石在围绕太阳转动时发生碰撞
But these impacts produced immense amounts of heat,
这种冲击力量是如此猛烈 从而产生了巨大的热量
as did underground radioactive decay.
这些岩石也给地球带来了大量的放射性元素
Eventually, when the outer layers of the planet cooled
最终，当地球外层冷却时
these two powerful sources of heat were trapped in a huge hot core.
这两种巨大的能量源被捕获在炽热的地核里
The center of our planet is around as hot as the surface of the Sun.
地球的中心和太阳的表面一样热
This is the source of Earth's vast heat energy.
捕获在地球内部的
And it was what fueled volcano to this day.
巨大的热量源至今仍然使火山不断喷发
Earth's hot core has been continuously releasing unimaginable amounts of heat.
仍然不断地释放着令人无法想象的巨大热量
Even after four and a half billion years,there are still plenty left.
在经历过45亿年后这种热量还大量存在
Volcanoes are the most obvious examples of the Earth's inner heat in action.
火山是地球内热活动的最明显的例子
