21.   If no accidents occur on the way, like punctured tires, diversions of traffic, sudden descent of fog, they will be on time.

22.   This is particularly liable to occur on shift handovers.

23.   Looting also appears to have occurred on a spectacular scale.

24.   The derivation of S M from the lattice theory has been made on the assumption that no heat or energy change occurs on mixing.

25.   Chatterton thought this event had occurred on the afternoon of the tenth of January, although he did concede that it might have been the eleventh.

26.   She had thought the shapechanger was in control of what was occurring on the planet.

27.   Further consideration of this would also require elucidation of whether TAGH induces similar phosphorylation of the receptor in vivo as occurs on membranes in vitro.

28.   A retroarc foreland basin occurs on the overriding plate behind the volcanic arc previously developed in association with the earlier subduction of oceanic lithosphere.

29.   Where the transform faults occur on land they are associated with significant topographic features such as the valley of the Irrawaddy River in Burma.

30.   Volcanic clusters occur both on continental and oceanic lithosphere, and are particularly common on the African Plate which apparently has a high concentration of hot spots.