Crushed concrete is made up of asphalt debris from other construction projects that can be reused to create driveways, pathways, garden beds and more. When any concrete structure, road, sidewalk or parking lot is demolished, that concrete is usually deposited in a landfill.
Crushed asphalt is exactly what it sounds like, old asphalt that's been recycled and crushed into tiny pieces suitable for use in paving and landscaping, among other things. It has many of the same properties as gravel but looks different in color and is also comprised of crushed-up, dried tar as well.
Pea gravel is typically made of river rock with smooth, rounded edges caused by erosion and natural weathering. The name “pea” refers to its size—usually 3/8″ in diameter.
River rock or gravel is round, smooth rock naturally shaped by erosion or weather as in a river or water setting. River rock does not pack and so is loose and rolls around. Its uses include drainage or decorative such as dry creeks.
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