Most people probably imagine an island as a piece of land that always stays the same. In reality, volcanic islands can keep changing because of volcanic activity, ocean waves, erosion, and landslides.
Surtsey, off the coast of Iceland, is a great example. The island began forming in 1963 during an underwater volcanic eruption, with the eruptive activity continuing until 1967.
Even after the eruption stopped, the island continued to change. Ocean waves gradually eroded softer material, while stronger volcanic rock helped parts of the island remain intact.
What makes Surtsey even more interesting is that scientists have been able to observe how life gradually arrived on land that was essentially brand new. Plants and other organisms slowly began establishing themselves there.
So, an island is not necessarily a permanent, unchanging piece of land. Under the right conditions, its shape can continue to change as natural processes take place.
