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ID number:234728
Author:
Evaluation:
Published: 27.01.2008.
Language: Latvian
Level: Secondary school
Literature: 3 units
References: Not used
Extract

Akmeņogles
Vielas atrašanās dabā
Veidojušās no augu atliekām
Veidojušās pirms 600 miljoniem gadu
Atrodamas joslu vai slāņu veidā
Fizikālās īpašības
Ogles ir cietas vielas
Sastāv no dažādiem minerāliem
Sastāv no oglekļa, kurā ir daudz piemaisījumu
Oglēs ir sēra un slāpekļa savienojumi

Iegūšana
4 raktuvju veidi:
Vertikālās šahtas
Horizontālās šahtas
Slīpās raktuves
Atklātās raktuves
Ķīmiskās īpašības
Sadegot izdalās liels siltuma daudzums
Oglēm sadegot, veidojas sēra un slāpekļa oksīdi

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