自从地球诞生以来，有新的水被创造出来吗?

如今，水占地球表面的71%，但这些水从一开始就存在吗?我们把德克兰的问题交给了裸体科学家克里斯·史密斯……

克里斯-新的水一直在被制造出来。首先，地球上所有的水最初是从哪里来的?因为地球大约有45亿年的历史，构成它的物质是早期太阳周围形成的一圈尘埃和气体，我们已经有了那种环境的模型，其中可能没有多少水。所以，地球上所有的水一定是从某个地方来的。最有可能的来源是彗星，它们是脏冰球，也有可能是小行星。现在人们已经测量了地球上水的生化和化学组成，并将其与彗星上的水测量结果进行了比较。他们研究的彗星似乎没有相同的化学组成。所以，我们认为小行星的同位素比例似乎更接近地球上的小行星的同位素比例似乎更接近地球上的小行星。所以我们认为，我们所拥有的水，大部分是在地球形成后的第一个10亿年左右，来自撞击地球的物质。但与此同时，这里有很多氢，地球上有很多氧。 The two can react together to produce water which they do all the time. In your body for example and in anything that's alive and respiring, we can take an example. If you burn a molecule of sugar, glucose - C6H12O6 and you burn it with 6 molecules of oxygen, 6O2, the product is some energy. That's what keeps you going plus, 6 molecules of CO2 (carbon dioxide) that you breathe out, plus, 6 molecules of water. You pee those out and you also breathe them out because you breathe out maybe half a litre or so of water every day. So, everything that's alive is doing that process. So, there's lots of water being made every day. So, the water molecules that are here are not the same water molecules but the chemicals that they're made from, the Earth is pretty much a closed system. We're losing a bit of hydrogen off into space which is rearranging molecules to make new ones all the time.