I was originally sandstone that was blown by the wind into a mountain and then into a volcano, where I melted into magma and erupted as lava. After cooling, I became rhyolite and was rolled by wind among plants until smashed by a tree root into bits that a stream carried into the ocean, where after years I became limestone. I then rolled near a volcano and was heated into marble, completing my journey of changing forms as a grain of sand over time.