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Америкийн Нэгдсэн Улс — Википедиа нэвтэрхий …
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Америкийн Нэгдсэн Улсhttps://mn.warbletoncouncil/recursos-naturales-america-13401WebАмерикийн хамгийн чухал байгалийн нөөц бол усны нөөц, газар тариалан, мал аж ахуй, ойн аж ахуй, усны аж ахуй, нүүрс ус, ашигт малтмал юм. Америк бол бусад …
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Кальци — Википедиа нэвтэрхий тольКальци (лат. Calcium) нь Ca гэж тэмдэглэгддэг, атомын дугаар 20 бүхий химийн элемент юм. Атом масс 40.078 amu. Кальци нь саарал өнгөтэй, зөөлөн шүлтлэг газрын металл бөгөөд Дэлхийн царцдаст байх массынхаа хэмжээгээр элементүүдийн дунд 5-рт орно. Мөн далайн усан дахь ангижирсан ионы молекулын тоо болон массын аль алинаар натри, хлор, магни, сульфатын дараа 5-д ордог.
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