Question

6b the graph below shows the average global temperature changes before and after mount pinatubos eruption in the philippines. sulfur from volcanic eruptions, like mount pinatubos, forms sulfuric acid particles in the upper atmosphere. according to the graph, these atmospheric particles appear to have caused global air temperatures to (1) generally decrease for one year (2) decrease, but then increase to normal levels in one year (3) generally increase for one year (4) increase, but then decrease to normal levels in one year

Explanation:

Looking at the graph, before the eruption (in 1991), the temperature was relatively high. After the eruption (in 1991 - 1992), the temperature decreased. The normal level is around 0. After the eruption, the temperature went below 0 (decreased) and then in about a year (by 1992 - 1993) it started to approach the normal level.

Answer:

1. Option 1: Incorrect. The temperature did not just decrease for one - year and stay down. It started to approach normal.
2. Option 2: Incorrect. The temperature decreased but did not increase back to normal in one year.
3. Option 3: Incorrect. The temperature decreased, not increased.
4. Option 4: Correct. Before the eruption (in 1991), the temperature was above normal (an increase from the normal level). After the eruption, the temperature decreased and started to approach the normal level in about a year.