Why? Some scientists think snow build-up in winter squishes the North Pole, making Earth's middle latitudes fatter. This tiny shape change relieves pressure, or weight, from volcanoes and may jolt an eruption--like uncapping a shaken bottle of soda.
Look at the graph below: Which season is least active?
FAST MOVERS: In an eruption, lava can travel up to 100 kilometers per hour (60 miles per hour)!
TIME TO EXPLODE
Mason's data (shown below) found a pattern in volcanic eruptions--something geologists have sought for over a century.
Number of eruptions Season in the last 300 years Winter (Dec.-Feb.) 1,185 Spring (Mar.-May) 1,117 Summer (Jun.-Aug.) 1,013 Fall (Sept.-Nov.) 1,026 * indicates a gap in the scale Note: Table made from bar graph.
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|Title Annotation:||Graph It!|
|Article Type:||Brief Article|
|Date:||Jan 12, 2004|
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