The graph below shows the average changes in monthly global air temperatures from 1990 to 1992. The time of a major volcanic eruption of Mount Pinatubo in the Philippines is shown. Mount Pinatubo erupts +0.4- +0.3- +0.2- +0.1- 0Average temperature -0.1- -0.2- -0.3- -0.4- -0.5 1990 1991 1992 Part A: Explain the effect that the eruption had, if any, on global air temperatures. Support your answer by citing specific evidence from the graph. Part B: Explain how this volcanic eruption could have caused the trend shown by the graph. Temperature Change (°C)

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**Monthly Global Air Temperature Changes (1990-1992)**

Below is the analysis and understanding of the average changes in monthly global air temperatures from 1990 to 1992, with a specific focus on the impact of the Mount Pinatubo eruption.

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### Analysis of Temperature Change

The graph provided illustrates the average changes in global air temperature over three years, from 1990 to 1992. The y-axis represents temperature change in degrees Celsius (°C), ranging from -0.5 to +0.4. The x-axis represents time, marked yearly from 1990 to 1992. 

A significant volcanic event, the eruption of Mount Pinatubo in the Philippines, is marked on the graph. This eruption is indicated to have occurred between 1991 and 1992.

### Observation of Temperature Trends

- **Pre-Eruption Period (1990 - Early 1991):** The temperature changes show fluctuations around an average line, with deviations both above and below 0°C. There are moments where the temperature change reaches a peak above +0.2°C but mostly hovers close to the baseline.

- **Post-Eruption Period (Late 1991 - 1992):** After the eruption of Mount Pinatubo, there is a noticeable decline in global air temperatures. The graph shows a steady drop, with temperature changes reaching values as low as -0.4°C shortly after the eruption.

### Educational Exercise

**Part A:** Explain the effect that the eruption had, if any, on global air temperatures. Support your answer by citing specific evidence from the graph.

**Part B:** Explain how this volcanic eruption could have caused the trend shown by the graph.

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In conclusion, the graph indicates a clear correlation between the eruption of Mount Pinatubo and a significant reduction in global air temperatures, showcasing the potential impact of volcanic activity on the Earth’s climate.

---

By understanding these trends, students can grasp the broader implications of natural events on global climatic conditions, emphasizing the interconnectedness of Earth’s systems.
Transcribed Image Text:**Monthly Global Air Temperature Changes (1990-1992)** Below is the analysis and understanding of the average changes in monthly global air temperatures from 1990 to 1992, with a specific focus on the impact of the Mount Pinatubo eruption. --- ### Analysis of Temperature Change The graph provided illustrates the average changes in global air temperature over three years, from 1990 to 1992. The y-axis represents temperature change in degrees Celsius (°C), ranging from -0.5 to +0.4. The x-axis represents time, marked yearly from 1990 to 1992. A significant volcanic event, the eruption of Mount Pinatubo in the Philippines, is marked on the graph. This eruption is indicated to have occurred between 1991 and 1992. ### Observation of Temperature Trends - **Pre-Eruption Period (1990 - Early 1991):** The temperature changes show fluctuations around an average line, with deviations both above and below 0°C. There are moments where the temperature change reaches a peak above +0.2°C but mostly hovers close to the baseline. - **Post-Eruption Period (Late 1991 - 1992):** After the eruption of Mount Pinatubo, there is a noticeable decline in global air temperatures. The graph shows a steady drop, with temperature changes reaching values as low as -0.4°C shortly after the eruption. ### Educational Exercise **Part A:** Explain the effect that the eruption had, if any, on global air temperatures. Support your answer by citing specific evidence from the graph. **Part B:** Explain how this volcanic eruption could have caused the trend shown by the graph. --- In conclusion, the graph indicates a clear correlation between the eruption of Mount Pinatubo and a significant reduction in global air temperatures, showcasing the potential impact of volcanic activity on the Earth’s climate. --- By understanding these trends, students can grasp the broader implications of natural events on global climatic conditions, emphasizing the interconnectedness of Earth’s systems.
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