3. (1) The eruption of volcanoes has caused death and misery throughout the centuries. (2) But in parts of Italy, Iceland, Chile, and Bolivia, volcanic steam is used to run heat and power plants. (3) Pumice, which is made from volcanic lava, is used as a grinder and polisher. (4) Sulfur produced by volcanoes is useful to the chemical industry. (5) Hawaiian farmers grow crops on land made rich by decayed volcanic material. (6) Clearly, in spite of all the damage they cause, volcanoes do benefit us in various ways.

[1] when the twins grew up, they continued to fight. [2] one day they decided to hold a contest to determine who was stronger. [3] though they tried to defeat each other in many different ways, neither one could win. [4] on the last day, they fought with weapons. [5] using a deer antler, the right-handed twin overpowered his brother, and he threw him off the edge of the earth. [6] today, the right-handed twin lives in the sky-world, and the left-handed twin lives in the dark underworld. [7] they rule the earthly world of men together.