Back in the days of the 3-speeds, when you shifted the gears there was a big difference in pedaling pressure and rate between the different speeds and you had to pedal harder or ease up more to 'catch up' to your normal pedaling rate and pressure depending on which gear you changed to.he shifter on the right side of your handle bar is for the rear derailleur. This shifter moves the chain back and forth between the sprockets on the freewheel on your rear wheel. This is where you make the small changes within the range you chose using the front derailleur.
Some people who sought refuge in trees survived the 1960 Chile tsunami, though others were torn from their branches. Why people put themselves at risk. Another fatal mistake people make when fleeing from tsunamis is underestimating how far the water can travel inland, Lopes said. In this graphic video of the 2011 Japan tsunami, shot from a hillside, residents fleeing the tsunami are nearly caught by the powerful wave even after it had already destroyed half the town. Tsunamis can travel as far as 10 miles (16 km) inland, depending on the shape and slope of the shoreline. Hurricanes also drive the sea miles inward, putting people at risk. But even hurricane veterans may ignore orders to evacuate.
A tsunami may be less than a foot (30 centimeters) in height on the surface of the open ocean, which is why they are not noticed by sailors. But the powerful pulse of energy travels rapidly through the ocean at hundreds of miles per hour.