Pillow basalts are smooth, spherical rock formations that occur when lava and frigid seawater interact.
Lava is molten rock that emerges as a liquid from under the Earth's surface. The term "lava" is also used to describe the rock that is generated when molten lava cools and solidifies. Either the substance is exceedingly stiff and barely flows, or it might be incredibly fluid, flowing nearly like syrup. The viscosity of the lava increases with silica concentration.
Hawaiian terms pahoehoe and aa (or a'a) refer to flows formed by mafic lavas, such as basalt. Smooth, subtly undulating, or extensively hummocky surfaces define Pahoehoe lava flows. A thin, still-plastic crust is dragged and wrinkled into twisted rope-like folds and rolls by the flowing molten lava beneath it.
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