The four main elements of the human body are oxygen, hydrogen, carbon, and nitrogen.
Answer:
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In terms of geology, his layer would be "crust" - the outermost surface layer of Earth.
The crust is differenciated from the next layer, "mantle" by its chemical composition.
Within the crust, we can be more specific by saying "pedosphere" - it's the part of the crust with soil, where vegetation can actually grow.
The Great Wall of china stretches roughly 5,500 miles across China. It was the first all man-made structure to be visible by space and is one of the world's largest tourist attractions.
