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  • Hey! Have you ever wondered how a volcano is formed?
  • Not really, I suppose.
  • So what is a volcano, anyway?
  • Usually, a volcano is hill or mountain with a vent that sometimes erupts lava and hot gasses.
  • This is a volcano. Volcanoes are formed by the plates of the Earth's crust. This one behind us is dormant, which means it is not erupting.
  • I thought we were taking the bus!
  • Sometimes, just the gradual movement of the plates can build up enough pressure to force magma, which is melted rock, through the Earth's crust.
  • Yeah, and the magma that spurts up, which is now called lava, eventually cools and hardens, making the volcano bigger and bigger.
  • That's pretty cool!
  • Volcanoes can also form at divergent boundaries, where plates are slowly moving away from each other. Magma can seep up through the cracks that form there, causing volcanic eruptions.
  • I sure didn't know that!
  • That's not all! Volcanoes can also form at convergent boundaries, where two plates crunch against each other. A trench is formed, and magma that seeps up in that trench can cause volcanic ecruptions.
  • To be continued next week.....
  • I guess I learned a lot today!
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