The island of Surtsey in the Atlantic Ocean is a basalt volcano which breached the ocean surface in 1963. The initial phase of Surtsey's eruption was highly explosive, as the magma was quite fluid, causing the rock to be blown apart by the boiling steam to form a tuff and cinder cone. This has subsequently moved to a typical pāhoehoe-type behaviour.
the island of surtsey in the atlantic ocean is a basalt volcano which breached the ocean surface in 1963 the initial phase of surtsey's eruption was highly explosive as the magma was quite fluid causing the rock to be blown apart by the boiling steam to form a tuff and cinder cone this has subsequently moved to a typical pāhoehoe-type behaviour