31.  The damage is a combination of natural forces plus lax enforcement of regulations and overuse of limited resources.

32.  The calculations measured the force of small thruster firings that helped counteract the effects of natural forces such as the solar wind -- energy particles streaming from the sun.

33.  The tradition holds, in part, that life derives from the natural forces of earth, water, fire and air.

34.  UFO groups say they are proof of extraterrestrial visitors, or some unexplained natural force.

35.  Also included is a measure to promote land zoning and housing improvement projects to help build cities more resistant to natural forces.