Useful resources that exist underground. Since the formation of the Earth, large-scale tectonic and igneous activity has taken place in the Earth's crust, causing various metallic and nonmetallic elements to move, disperse, and concentrate, resulting in the creation of underground resources in specific locations in the Earth's crust. This includes metallic and nonmetallic minerals and geothermal energy. Coal, petroleum, natural gas, and some rocks are underground resources formed by the secondary deposition of plants, animals, and soil and sand. Water, which has passed through the atmosphere and the Earth's surface and is stored underground, is also an important underground resource. Underground resources are unevenly distributed in different regions, their value fluctuates depending on technological developments and economic efficiency, and many of them are finite, but they are important as industrial raw materials. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
地下に存在している有用資源。地球生成以来,地殻の中で大規模な構造運動や火成活動が行われ,種々の金属・非金属元素が移動・分散・濃縮して,地殻の特定の場所に地下資源が生成された。このようにしてできたものには,金属・非金属鉱物,地熱などがある。石炭,石油,天然ガスおよび一部の岩石は,動植物および土砂が2次的に堆積して生成した地下資源である。大気圏および地表を経て地下にたくわえられている水も重要な地下資源の一つである。地下資源は地域的偏在性があり,技術の発達と経済性によってその価値が変動し,その多くは有限であるが,工業原料として重要である。
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