B
Wind,water,fire and ice-these powerful natural forces shaped the land of America in the past.They are still changing it today.The Colorado River slowly cut down through stone to make the Grand Canyon(大峡谷).
Wind and rain storms hit the land from time to time.Fires sometimes burn down forests and destroy the homes of wild animals.This happened in Yellowstone Park in 1988.
Dead volcanic(火山) mountains such as Haleakaia on Maui and Crater Lake in Oregon are beautiful to look at.But there are several active volcanoes in the US,especially along the Pacific Coast.There are also many earthquakes in this area.Scientists can do nothing to control earthquakes or volcanoes.This was shown clearly on May 10,1980.At 8:32 that morning,Mount St.Helens in Washington state erupted. The top of the mountain was blown off.
Over 60 people-campers,scientists,journalists,and forest workers were killed.Hundreds of square miles of forests were knocked down.In towns over 100 miles away,day suddenly became night. An ash cloud hid the sun for many hours.Towns and fields in Washington,Oregon,and Idaho were covered with dirty gray ash.
Scientists knew that Mount St.Helens might erupt soon.But no one could say when. Scientists had asked people to move away because the volcano was becoming dangerous.But Harry Truman would not leave his home.Now it is covered with many feet of dirty ash.
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