What Makes Some Volcanoes Explode and Others Just Bubble?

Some volcanoes explode like popcorn in the microwave, while others just bubble like a pot on the stove. Let’s find out why!

What's Inside the Volcano?

Think of a volcano like a soda bottle, it has pressure inside it. When you shake it up and open it quickly, boom! It explodes like a fizzy eruption.

But if you just let it sit on the stove, it slowly bubbles and hisses, that’s more like a gentle volcano.

The Pressure Game

Some volcanoes have magma (hot melted rock) that's full of gas. When the pressure gets too high, kapow! It explodes, like when you pop a balloon with your finger.

Other volcanoes are more laid-back. Their magma is slower and calmer, so they just bubble and ooze out, like a lava lamp slowly changing colors.

So it’s all about pressure and how fast things move inside the volcano. Some go boom, others just bloop!

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Examples

  1. A volcano with thick, sticky lava might explode, while one with runny lava just bubbles.
  2. Imagine a cake batter versus honey, the thicker one is harder to pour out.
  3. Mount Vesuvius exploded because of its thick magma, but Kilauea only gently flows.

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