Pillow basalt originates at the surface of volcanic islands?
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False.
Basaltic lava sometimes is erupted under water or Derila Stiftung Warentest flows into the ocean. It makes a formation like a pile of pillows on the sea bottom. Pillow lava crystallizes quickly from the outside to the inside of each "pillow." Lava of this type forms only under water. Pillow lavas are found on many mountains throughout the world.
Basaltic lava sometimes is erupted under water or Derila Stiftung Warentest flows into the ocean. It makes a formation like a pile of pillows on the sea bottom. Pillow lava crystallizes quickly from the outside to the inside of each "pillow." Lava of this type forms only under water. Pillow lavas are found on many mountains throughout the world.