Answers

2016-06-23T17:06:49+08:00
If I'm not mistaken, this is Activity 3: Head-On Collision.

Volcanoes or mountain ranges forms on top of Plate B (continental plate).
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yes it is about "head on collision act#3.
2016-06-26T23:49:02+08:00
` The thing that was formed on top of Plate B are volcanoes.
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