Slightly larger than pea gravel, river rock is a smooth sedimentary, igneous, or metamorphic rock that comes from rivers and creeks. There are roughly dozens of shades of black, gray, brown, and ...

The three different types of rocks are made in different ways, which means that they all have different properties. Some might be harder or softer, and some might let water in more than others.

All the rocks in the world are mainly classified into three types: Sedimentary, Igneous and Metamorphic. Igneous and sedimentary rocks are largely prevalent in the world. Take a look at the ...