Pillow Lava
Pillow lavas are lavas that contain characteristic pillow-shaped structures that are attributed to the extrusion of the lava under water, or subaqueous extrusion. Pillow lavas in volcanic rock are characterized by thick sequences of discontinuous pillow-shaped masses, commonly up to one metre in diameter. They form the upper part of 'Layer 2' of normal oceanic crust.
Read more about Pillow Lava: Composition, Occurrence, Formation, Use As A 'Way-up' Criterion
Famous quotes containing the words pillow and/or lava:
“Weariness
Can snore upon the flint, when resty sloth
Finds the down pillow hard.”
—William Shakespeare (1564–1616)
“We walk on molten lava on which the claw of a fly or the fall of a hair makes its impression, which being received, the mass hardens to flint and retains every impression forevermore.”
—Ralph Waldo Emerson (1803–1882)