Here's how it happens:
* Volcanic Eruptions: When volcanoes erupt, they release molten rock (magma) that comes into contact with air or water.
* Rapid Cooling: This rapid cooling causes the magma to solidify quickly.
* Gas Expansion: Dissolved gases trapped within the magma expand as the pressure decreases during the eruption.
* Frothy Structure: The expanding gases create tiny bubbles within the solidifying rock, resulting in a light, porous structure.
Pumice is often described as having a "frothy" or "sponge-like" texture. It's so light that it can actually float on water!
