We calculate the actual speed of the tsunami by measuring the water depth at a point in time when the tsunami passes by. A tsunami's ability to maintain speed is directly influenced by the depth of the water. A tsunami moves faster in deeper water and slower in shallower water. So unlike a normal wave, the driving energy of a tsunami moves through the water as opposed to on top of it. Therefore, as a tsunami moves though deep water at hundreds of miles an hour, it is barely noticeable above the waterline. A tsunami is typically no more than 3 feet (1 meter) high until it gets close to shore. Once a tsunami gets close to shore, it takes its more recognizable and deadly form.
Adult head lice can live for approximately 24 hours away from a host, according to the Centers for Disease Control. Nymphs, or young head lice, can live for only several hours away from a host. Lice eggs are less dependent on a host, and they can live for up to one week without a host. Continue Reading.
Where do head lice live? Head lice feed on blood and therefore stay close to the scalp where there is an abundant supply of food. After the nits hatch, they move from the hair shafts to your scalp to find sustenance. Youâll find nymph and adult lice most commonly on the scalp around the back of your neck and ears. They might also live in your eyebrows or on your eyelashes. When fed, head lice can live for up to a month, but they will die within a day or two if they are not able to feed on blood.