Rocks are made from minerals, which like all matter are composed of individual chemical elements. What makes minerals special is the way that the atoms of those elements are arranged in lattices which create unique crystalline structures and shapes. Today more than 4,000 different minerals can be found on Earth. When the planet began to be formed, however, few existed. Curious as to how this great variety came about, Robert Hazen of the Carnegie Institution in Washington, DC, and a team of colleagues set out on their own voyage of discovery. Their study, just published in American Mineralogist, explores the history of minerals by identifying how much of the diversity was created by the rocks alone and how much of it was created by the evolution of life.
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Today more than 4, 000 different minerals can be found on Earth. When the planet began to be formed, however, few existed.
地球上目前已发现的矿物超过4000种，然而地球形成之初的矿物种类却寥寥无几。
Today more than 4,000 different minerals can be found on Earth. When the planet began to be formed, however, few existed.
地球上目前已发现的矿物超过4000种，然而地球形成之初的矿物种类却寥寥无几。
It might surprise you to learn that restaurants, as we know them, have only existed for a few centuries.
当你得知我们所知道的餐馆只存在了几个世纪，你可能会感到惊讶。
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