sentences: physical weathering is a mean of weathering
docs: weathering is becoming. temperature is physical_property. cold_temperature_activity is physical_event. tripping is physical_contact_making_event. weather is physical_event. weathering is physical_event. degree_of_storminess is weather_attribute. global_warming is effecting_weather. lengthening is physical_event. degree_of_snowiness is weather_attribute.