24. emormous masses of ____ rock all over the world, such as the Columbia Plateau in the northwestern U.S., give evidence of some huge catastrophic action.

granite
mountainous
sedimentary
volcanic

volcanic right?

Yup.... absolutely

Actually, the correct answer is "volcanic."

To arrive at this conclusion, we can analyze the given information. The question mentions "enormous masses of ____ rock all over the world." From this, we can deduce that the answer is related to rocks. The next clue is the mention of the "Columbia Plateau in the northwestern U.S.," which is a specific geographical region.

Now, let's consider the options we have:

1. Granite: Granite is an igneous rock, but it does not necessarily indicate catastrophic action. Therefore, we can eliminate granite as the answer.

2. Mountainous: This term refers to the presence of large mountains but does not contribute to the idea of catastrophic action related to rocks. Thus, we can eliminate mountainous as the answer.

3. Sedimentary: Sedimentary rocks are formed by the deposition and compression of sediments over time. Although they are found all over the world, they do not necessarily indicate catastrophic action. Therefore, we can eliminate sedimentary as the answer.

4. Volcanic: This option refers to rocks and the occurrence of volcanic activity. Volcanic activity is often associated with catastrophic events such as volcanic eruptions, which can result in the formation of large masses of volcanic rock. Therefore, volcanic is the most suitable answer.

So, the correct answer is "volcanic." The presence of enormous masses of volcanic rock all over the world, such as the Columbia Plateau in the northwestern U.S., is evidence of some huge catastrophic action.