What is the stuff inside volcanoes?

Answer 1

Inside a volcano is lava. But actually, we call it magma. so really, the answers is: magma

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lava....hot burning lava!

Answer 2

Inside volcanoes, there is a mixture of molten rock (magma), gases, and solid rock fragments (pyroclasts). This combination builds up pressure beneath the surface until it is eventually released through an eruption.

Answer 3

magma

Magma is lava when it's below or inside the Earth's crust. Lava when it's on the Earth's surface after erupting. There's also a build-up of toxic hot gases, etc.

Answer 4

Rocks