The Secret Life of Rocks

Rocks come in all shapes and sizes. Some are rough and jagged, while others are smooth and shiny. Each rock has its own special story to tell.

Igneous rocks are born from fire. They are formed when hot, melted rock called magma cools down and hardens. Granite and obsidian are two types of igneous rocks.

Sedimentary rocks are made from layers of sand, mud, and other materials that have been pressed together over time. Sandstone and limestone are examples of sedimentary rocks.

Metamorphic rocks have been changed by heat and pressure deep underground. They started as one type of rock, but were transformed into something new. Marble and slate are metamorphic rocks.

Rocks may seem like they never change, but they are always on the move. Over thousands of years, they are broken down by wind, water, and ice. Their secret lives continue to unfold all around us.