Now that we have covered the features found in igneous, sedimentary and metamorphic rocks, and seen how these features can be explained by the processes that formed the rocks, here is a useful point at which to have a break before continuing with the next section. Before returning, you might like to see for yourself what types of rock you can find in your area. Can you identify their texture, or spot any fossils? Surfaces that haven't been obscured by grime or lichens are by far the best, as it is the attributes of the rock itself, not any later weathering processes that we are interested in. Polished work surfaces, ornamental stones, grave stones and shop fronts are interesting possibilities to start with. And avoid rocks whose grain size is so small that you can't recognise individual grains; a microscope is needed for studying those rocks!