Mixed Prepositions Exercise 6

Complete the text below by choosing the correct prepositions, then press "Check" to check your answers.
Long before any recorded human history in Yellowstone National Park, a massive volcanic eruption spewed an immense volume ash that covered all of the western U.S., much the Midwest, northern Mexico and some areas of the eastern Pacific Coast. The eruption dwarfed that of Mt. St. Helens 1980 and left a huge caldera. Yellowstone typically erupts every 600,000 900,000 years with the last event occurring 640,000 years ago. Its eruptions are among the largest known to have ever occurred Earth, producing drastic climate change the aftermath. The park was named the yellow rocks seen the Grand Canyon of the Yellowstone - a deep gash in the Yellowstone Plateau that was formed floods during previous ice ages and river erosion from the Yellowstone River.

Source: http://en.wikipedia.org/wiki/Yellowstone_National_Park
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