
Concept explainers
To calculate: To order the volcano eruption rates from greatest to least eruption rate

Answer to Problem 21PT
Volcanoes are arranged in order of greatest to least eruption rates:
Volcano | Date | Eruption rate |
Bezymianny | 1956 | 2×105 |
Santa Maria | 1902 | 4×104 |
Agung | 1963 | 3×104 |
Mount St. Helens | 1980 | 2×104 |
Hekla | 1947 | 2×104 |
Helka | 1970 | 4×103 |
Naguruhoe | 1975 | 2×103 |
Explanation of Solution
Given information: Table showing the greatest amounts of lava in cubic meters per second that erupted from six volcanoes:
Volcano | Date | Eruption rate |
Mount St. Helens | 1980 | 2×104 |
Naguruhoe | 1975 | 2×103 |
Helka | 1970 | 4×103 |
Agung | 1963 | 3×104 |
Bezymianny | 1956 | 2×105 |
Hekla | 1947 | 2×104 |
Santa Maria | 1902 | 4×104 |
Calculation:
Converting the eruption rates into standard form
Case1: Mount St. Helens in year 1980
Converting 2×104 into standard form
⇒2×104=20000
Case2: Naguruhoein year 1975
Converting 2×103 into standard form
⇒2×103=2000
Case3: Helkain year 1975
Converting 4×103 into standard form
⇒4×103=4000
Case4: Agungin year 1963
Converting 3×104 into standard form
⇒3×104=30000
Case5: Bezymiannyin year 1956
Converting 2×105 into standard form
⇒2×105=200000
Case6: Heklain year 1947
Converting 2×104 into standard form
⇒2×104=20000
Case7: Santa Mariain year 1902
Converting 4×104 into standard form
⇒4×104=40000
Now, arranging in order of greatest to least eruption rate
Volcano | Date | Eruption rate |
Bezymianny | 1956 | 2×105 |
Santa Maria | 1902 | 4×104 |
Agung | 1963 | 3×104 |
Mount St. Helens | 1980 | 2×104 |
Hekla | 1947 | 2×104 |
Helka | 1970 | 4×103 |
Naguruhoe | 1975 | 2×103 |
Conclusion:
Hence, volcanoes are arranged in order of greatest to least eruption rates.
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