My macbook pro fan began to be very loud. How can I fix this?

I am unsure as to why this is occurring, but I have heard this can be caused by software rather than a hardware issue. I am led to believe this is the case because my fan is not loud all of the time, only some times and in random bursts. How can I stop this?

Do a SMC reset > http://support.apple.com/kb/HT3964
When your fans are loud, open Activity Monitor (in /Applications/Utilities) and choose "All Processes" above "Show" in the toolbar. Then, look for processes that are taking a lot of RAM and CPU, and copy their name here with their CPU and memory usage

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