题目内容：

Along the Ring of Fire

Off the coast of Alaska, the lava rises through cracks (裂缝) at the bottom of the Pacific Ocean. It flows like toothpaste pressed from a tube. Spreading and erupting, the earth slowly builds a new island.

Along the Pacific coast of South America, one part of the earth’s surface gradually moves toward another. Although difficult to believe, the rocky outer surface of Earth is not solid; rather, it is broken up into huge pieces called plates(板块). 1., the action can sometimes lead to volcanic activity.

These things take place thousands of miles apart, yet they are connected. Surrounding the Pacific Ocean is a circle of volcanoes that includes more than half of the world’s active volcanoes.2..

The Ring of Fire spreads from the west coast of South America northward to Alaska. It goes left at the Aleutian Islands and crosses the Pacific Ocean. Then it heads down the east coast of Asia toward New Zealand.

3.. In 1883 Krakatoa erupted four times. The third eruption was so loud that it could be clearly heard 3,000 miles away. Krakatoa threw a large dust cloud nearly 50 miles into the air. 4.. During four days in June, Pinatubo threw out more than 20 million tons of broken pieces into the air, destroying many homes.

Some volcanoes erupt more quietly, with lava flowing through the cracks in Earth’s surface. This type of volcano is found in Hawaii. 5..

A.This area is called the Ring of Fire

B.Although the plates are connected

C.As the plates move past one another

D.The Ring of Fire is also where most earthquakes happen

E.Major volcanic eruptions along the Ring of Fire make history

F.In 1991 Mount Pinatubo in the Philippines erupted after 600 quiet years

G.Lava from a volcano tends to advance slowly but still causes great damage