Natural Process Propulsion Process https://www.commoncoreontologies.org/EventOntology heat from a fire causing ashes to rise into the sky A Natural Process in which one or more Forces are generated and applied to a participating Object such that the Object is set in Motion or has the direction or magnitude of its Motion altered. In each case, a Propulsion Process minimally involves the Object being propelled, a Reaction Mass (e.g. a portion of water, atmosphere, exhaust, etc.), and the Force(s) acting between these two entities. the wind blowing leaves across a lawn turning a paddle wheel against a portion of water to propel the paddle boat forward launching a water balloon using a sling shot a twin-engine turboprop plane rotating both of its propellers against a portion of atmosphere to propel the plane forward burning a portion of fuel to produce exhaust that is ejected through a jet nozzle to propel a rocket and its payload an apple falling to the ground under the power of Earth's gravitational force