Here's a breakdown:
* Basalt: This is the most common type of rock found on Surtsey. It's a dark-colored, fine-grained volcanic rock formed from quickly cooled lava. The initial volcanic eruptions that formed the island spewed out large amounts of basalt.
* Tuff: This is a type of rock formed from compacted volcanic ash and other volcanic debris. It's also found on Surtsey, often mixed with basalt.
* Other Volcanic Rocks: While basalt and tuff are the dominant rock types, smaller amounts of other volcanic rocks like scoria (porous volcanic rock) and agglomerate (rock formed from cemented volcanic fragments) can also be found.
It's important to note that Surtsey is a young island still undergoing geological changes, so the rock types and their distribution can vary across the island.
