Volcanic Eruption - Mount Sakurajima in Japan

Japan's most active volcanoes, Mount Sakurajima, erupted for the 500th time this year. At 5000m, this is the highest plume of ash recorded from the mountain since 1955, and caused darkness and ash falls over the centre of nearby Kagoshima city. Read more about this on http://sg.news.yahoo.com/blogs/geekquinox/record-breaking-eruption-japanese-volcano-launches-ash-5-040020140.html

You would have studied in Geography that Japan lies within the Pacific Ring of Fire.
Points to Ponder:
What is an active volcano?
Why are many volcanoes found at the Pacific Ring of Fire?
What are the hazards caused by volcanic eruptions?
Why do people continue to live in areas threatened by volcanic eruptions?

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