It is because of subduction<span>: oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper </span><span>mantle </span><span>(subduction). This is like a giant recycling system for oceanic lithosphere! Because continental crust is lighter than oceanic crust, continental crust cannot subduct. We therefore still have some very </span>old continental rocks<span> at the surface of the Earth.</span>
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China is growing exponentially as a provider of steel and other products, and it makes complete sense since the nations economy is rising at an incredible pace. The United States traditionally was a huge supplier, but over the past 12 years China has been building structures at an unprecedented rate, and steel being the huge component of large skyscrapers this is one of the biggest reasons for its growth over the decade
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most were called Alexandria and the Egyptian city also
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