Pacific Ocean pillow basalt main content.

Pacific Ocean pillow basalt

Pacific Ocean Pillow Basalt AMNH/R.Mickens

Exhibition Text

The glassy crust has broken off the rounded surface of this pillow, exposing the dark, fine-grained basalt beneath. The radial pattern of fractures on the side is typical of pillows that cool quickly from their outer surface ot their center, quenched by cold seawater.

Loaned by the Geological Survey of Japan

For Educators

Topic: Earth Science

Subtopic: Volcanoes

Keywords: Ocean bottom, Volcanoes, Magmas, Mid-ocean ridges, Lava, Japan

Audience: General