mechanical weathering means breaking down rocks from a larger whole into smaller pieces by mechanical means
chemical_mechanical_planarization is not grinding. weathervane is mechanical_device. weathering is not becoming. weathering is not physical_event. enfilading is raking. weathering is physical_event. winding is not forging. snowing is atypical_thing. chemical_mechanical_planarization is grinding. snowing is not atypical_thing.