Aquarium guide
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FRESH WATER
 

FRESH WATER

This type of water is also known as Continental water, a more accurate term from the scientific point of view. Continental water accounts for only 2.6% of the Earth's water, the rest being made up of seas and oceans. Of this volume, 98% consists of sterile water, in the form of glaciers and underground water, leaving only the water of rivers, lakes, and ponds as shelter for living organisms- barely 2% of the total volume of Continental water.


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ШЕЕЛИТ , минерал группы вольфраматов, CaWO4. Примеси МоО3 (в молибдошеелите до 24%). Белые, серые кристаллы, зернистые агрегаты. Твердость 4,5-5; плотность 6,1 г/см3. Встречается в скарнах, гидротермальных жилах и др. Руда вольфрама.