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- verb Simple past tense and past participle of
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Low lava domes like those of Iceland mark where last the basalt outwelled and spread far and wide before it chilled (Fig. 341).
On the steep sea cliffs of the island, where its structure is exhibited, the sheets of lava are seen to be cut with many DIKES, -- fissures which have been filled by molten rock, -- and there is little doubt that it was through these fissures that the lava outwelled in successive flows which spread far and wide over the country and gradually reared the enormous pile of the plateau.