ISEE Reading Question 239: Answer and Explanation
Home > ISEE Test > ISEE Reading Practice Tests
Test Information
- Use your browser's back button to return to your test results.
- Do more ISEE Reading Practice Tests.
Question: 239
2. A volcanic eruption is likely to be most explosive if magma
- A. is thin and runny
- B. is thick and sticky
- C. rises and collects in magma chambers
- D. pushes out through fissures in the Earth's surface
Correct Answer: B
Explanation:
B is correct. As stated in the second paragraph, “How explosive an eruption is depends on how runny or sticky the magma is.… If magma is thick and sticky, gases cannot escape easily. Pressure builds up until the gases escape violently and explode.” Choice A is wrong because if magma is thin and runny, “gases can escape easily from it,” and when this type of magma erupts, “it flows out of the volcano.” Choices C and D are both true of magma, but neither indicates how explosive an eruption will be.