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The difference between river rock and landscaping rocks is size, smoothness, and use. River rocks are smooth and flat, as if polished by water, and come in diameters between 1 and 8 inches. Landscape rock can vary in size from small pea gravel installations to car-sized boulders. However, landscaping and river rocks are interchangeable in many situations. River rock is best for pathways, walkways, garden bed mulch, water features, and planting accents, while small landscape rocks can serve as a walkway base, gravel playground areas, and filler between pavers.

Cobblestone can be made from many different types of stones but the most common ones, by far, are granite, basalt, limestone, and sandstone.  If you are laying a brick paver patio or other such project, the medium is different. It’s rare, but cobblestone can also be made from marble, slate, jasper, and other types of rock. Technically, you can make cobblestone from almost any type of rock, but if it is weather-resistant and stands the test of time is another question entirely.

Cobblestone is not a type of rock but a term for a mosaic or rock laid down as a surface. It used to be made from the closest available stone but now can be made from nearly any hard rock, as machining has made shaping the stone much easier and cheaper.

It is possible, albeit a lot slower, to break up a rock using water. You would do this by freezing and thawing the water. You could create some initial holes or cracks in the rock, then pour water into the cracks or holes and allow them to freeze (so it's best to do this in winter or in colder climates). Since water expands when it freezes, this puts pressure on the inside of the rock and causes it to crack. You could continue to pour more water in and let it freeze to continue to break up the rock.