* Minerals: Think of gold, diamonds, iron ore, salt, and many more. These are naturally occurring solid substances with a defined chemical composition and crystal structure.
* Rocks: Rocks are made up of one or more minerals. Granite, limestone, sandstone, and basalt are all examples.
* Fossil Fuels: Coal, oil, and natural gas are formed over millions of years from the remains of ancient plants and animals.
* Soil: Soil is a complex mixture of minerals, organic matter (decomposed plant and animal material), water, and air.
Let me know if you'd like to explore any of these in more detail!
