•By early 1964, the island was built up enough that water could not reach vents, and volcanic activity calmed. Lava flows created a harder substrate over loose volcanic deposits, stabilizing the island. By June 1967, eruptions had ceased and Surtsey has since remained dormant.
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Answer:
• By early 1964, the island was built up enough that water could not reach vents, and volcanic activity calmed. Lava flows created a harder substrate over loose volcanic deposits, stabilizing the island. By June 1967, eruptions had ceased and Surtsey has since remained dormant.