Ways to cause melting (volcanic activity) on a planet or sattelite?

purplemurple

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Jan 23, 2011
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There are 4 main ways to cause melting (volcanic activity) on a planet or sattelite. Increasing temperature is one way, what are the other three ways?

The only other one I can think of is tidal energy....
I do pay attention in class actually. Thanks
But aren't those all just ways of increasing temperature or providing heat?
That's where my confusion is.
If you're going to answer questions, don't lecture, just answer. Otherwise, dont bother.
 
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