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People living on these Indonesian islands experience a lot of volcanic activity/activities.

Hi,
Do both activity and activities fit in the above? If yes, do they make a difference in meaning? Thanks.
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The plural is wrong here; what is wanted is the uncountable.
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Mister Micawber.
The plural is wrong here; what is wanted is the uncountable.
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Thanks, Mister.

But why isn't it the plural activities since it's "a lot of volcanic activities?"
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We don't call them 'activities'-- we call them 'eruptions' or 'smoke plumes' or whatever. Activity is the general, well, activity going on in the area. The countable noun is inappropriate here.

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