It can be a stream of water that can transport undissolved particles by bouncing them along the stream bed. A mountain stream in spring is often opaque and milky with suspended sediment. Another transport method is by wind. Occasionally, very fine dust gets carried high into the atmosphere and is carried great distances. Red dust from the Sahara sometimes travels as far as Britain and northern Europe to coat windows and cars.
Wind can also transport particles by saltation along the ground and in suspension as dust.
Oak Ridges Quarry, Ontario. Here you can see layers of gravel that were deposited during glaciation. Dundas Quarry, Ontario. The sedimentary rock shown here contains various minerals, such as calcite. The size of particles that settle is controlled by this speed.