Part 5:

How is a volcano formed?

A volcano is a mountain formed by the magma erupted from the depths of the earth. Mt. Fuji with a beautiful conical shape and Mt. Aso with a huge caldera surrounded by the outer rim are typical examples of volcano. How is such a volcano formed? Contents

	Page 1:	Structure of the earth
	Page 2:	Motion of the plate
	Page 3:	How is the magma generated?
	Page 4:	How is a volcano formed?
	Page 5:	Observation of the lava from Mt. Fugen with a microscope
	Page 6:	Let's look at the Philippine Sea Plate.
	Page 7:	Underground structure of Kyushu Island observed with seismic wave
	Page 8:	Underground structure of Kyushu Island observed with electric conductivity

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