In the following sentence, identify the phrase that needs correction:

The beautiful Grand Canyon is a natural wonder that was **formed over million of years** by the Colorado River.

Question

In the following sentence, identify the phrase that needs correction:

The beautiful Grand Canyon is a natural wonder that was **formed over million of years** by the Colorado River.

Accepted Answer

**Solution:**

1. The phrase **"million of years"** is incorrect because the word "million" should be pluralized as "millions" when referring to a large, indefinite number of years.

2. The correct phrase is **"formed over millions of years"** which properly uses the plural form to indicate a long period.

3. Other options like "form over millions of years" or "forms over millions of years" are grammatically incorrect because the verb tense does not agree with the past passive construction "was formed."

4. The option "formed over 1 years" is incorrect due to the mismatch between the singular number "1" and the plural noun "years."

5. Therefore, the best correction is option (a) **"formed over millions of years"**.

**Answer:** formed over millions of years

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