When we understand how the earth is made up (its structure) it can help us in many things. First of all, in a country like Qatar, this is important so we know how deep and where to dig to find petroleum and natural gas. In general it is helpful for studying the earth, for knowing how deep it is safe to dig, to know about the habitats of underground animals, and to be able to find gems and precious stones. Knowing the structure of the earth can also help us when we are studying minerals. Another very important things about knowing the structure of the earth is to find out where to dig for water, and knowing which parts of the earth are fertile for planting.
(both questions answered in one paragraph).
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