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3 votes
Read the following sentence, which contains grammatical errors:

Crater Lake was formed 7,700 years ago Mount Mazama erupted and
collapsed leaving a basin that eventually filled with water.
Which revision best corrects this sentence?

1 Answer

2 votes
Crater Lake was formed 7,700 years ago when Mount Mazama erupted and left behind a basin that eventually filled with water.
User Richard Osseweyer
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