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The proton motive force arises from a combination of the concentration gradient of protons and a voltage gradient across the membrane (the protons are positively charged, so an imbalance of protons means that the side of the membrane with more protons has a positive charge relative to the side with fewer protons).
Tsunamis occur after an earthquake. The earthquake can occur under a city (ex. The New Madrid Missouri fault line; or the Los Angeles area's fault lines), but many occur on the ocean or sea floor.n average, two tsunamis occur per year. Approximately every 15  years a destructive, ocean-wide tsunami occurs. Tsunami's occur  when an earthquake causes a significant ver â¦ tical deformation of the  seafloor.