The magma and lava of Surtsey has a composition of alkali Olivine Basalt.
Lava domes are generally composed of felsic, highly viscous lava, usually dacite or rhyolite.
Both pillow lava and pahoehoe lava have about the same composition and harden into a kind of rock called basalt.
andesite
there is a type and its lave
Mount Pelee is an active volcano in the West Indies. Its magma composition is andesitic, having a cone that is composed of layers of hardened lava.
Lava will cool to form extrusive igneous rock. The exact type would depend on the composition of the lava.
Lava will cool to form extrusive igneous rock. The exact type would depend on the composition of the lava.
The composition of the magma or lava that it cools from.
Composition, heat, and pressure.
It varies in composition, but is usually andesite, dacite, or rhyolite.
Niether. Pahoehoe and a'a are both varieties of basaltic lava. The material from Pinatobo is of a dacitic composition, which is much more viscous than a'a or pahoehoe. It tends to erupt explosively, producing ash and pumice rather than lava flows. When dacitic lava does flow it creates a block lava flow.