Common types of flagstone include sandstone ... One unifying trait is that all river rock has been worn down by moving water, so it has a smooth surface. Like pea gravel, these garden rocks ...

There are lots of types of rock and each type has different ... local area - how many can you spot? Make a list of all the different rocks you saw. Can you think of ways to group and compare ...

they have been adapted to allow for measurements of fine-grained rocks.” All kinds of different stones were included in the study, with other variables taken into account too. These included ...