</noinclude> [[image:Nur05018.jpg|thumb|right|200px|Pillow lava (NOAA)]] :'''Pillow lava''' is the rock type typically formed when lava emerges from an [[W:submarine volcano|underwater volcanic vent]] or a lava flow enters the ocean. The viscous lava gains a solid crust immediately upon contact with the water, and this crust cracks and oozes additional large blobs or "pillows" as more lava emerges from the advancing flow. Since the majority of [[W:Earth|Earth]]'s surface is covered by water, and most volcanoes are situated near or under it, pillow lava is very common. Examples of this can be seen at [[W:Llanddwyn Island|Llanddwyn Island]]. <br style="clear:both">
