- Rocks are the oldest things on Earth, found everywhere including cities, oceans, and under soil.
- Igneous rocks form from cooled magma or lava; examples include granite and obsidian.
- Sedimentary rocks form from layers of sediment like sand and mud that harden over time; examples include limestone and sandstone.
- Metamorphic rocks form when existing rocks change due to heat, pressure, and time deep underground; examples include marble and quartzite.
- Rocks never die—they continuously transform into new types over long periods.
Parent Tip: Review the logic above to help your child master the concept of 4th grade summarizing worksheet.