Answer:Silt<Sand<Pebble<Cobble<Boulder
Explanation: SILT is too small for individual grains to be visible.
SAND ranges from 2mm down to 0.063mm.
PEBBLE ranges from 8mm to 16mm in size
COBBLE will fit in one hand, and its size ranges from
64mm to 128mm(for small pieces).
BOULDER is bigger than a toaster and difficult to lift.