Because there are not yet any technology in the current down to collect samples and environmental measurement under the Earth in great depth. However, humans are also trying to find information about the structure of the world, directly from multiple methods. Such studies from drilling survey. Study on series of Ophiolite rocks (rock group in the past of the crust beneath the ocean, but now found on land) Study on volcanic rocks Study on the chemical components of the fishing bat taka-on Earth and rock samples from the Moon, etc.
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