CHANGES DUE TO WATER EROSION - Students observe river rocks to determine the erosional factors which smooth the rocks over time.
(the erosional factors; smooth; the rocks; T:over time) (WATER EROSION - Students; observe; river rocks; to determine the erosional factors) Context(WATER EROSION - Students observe,List([15, 47))):(WATER EROSION - Students; observe river rocks to determine; the erosional factors which smooth the rocks over time)
WATER EROSION - Students observe,List([15, 47))
the erosional factors WATER EROSION - Students WATER EROSION - Students
smooth observe observe river rocks to determine
the rocks T:over time
river rocks to determine the erosional factors
the erosional factors which smooth the rocks over time