Usages of jarðlagið
Sum jarðlaganna eru mjög þykk.
Some of the geological layers are very thick.
Mörg jarðlaganna eru úr dökku basalti.
Many of the geological layers are made of dark basalt.
Nokkur jarðlaganna eru úr gjósku, þar sem svæðið er virkt.
Several of the geological layers are made of tephra, since the area is active.
Sum jarðlaganna kunna að vera úr gjósku.
Some of the geological layers may be made of tephra.
Við köllum nokkur jarðlaganna basalt á þessum kvarða.
We call some of the layers basalt on this scale.
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