Before a volcanic eruption 1. find out about the volcanic risk in your community. ask your local council about emergency plans and how they will warn you of a volcanic eruption. 2. build an emergency supply kit, which includes items like non-perishable food, water, a battery-powered or hand-crank radio, extra flashlights and batteries. you may want to prepare a portable kit and keep it in your car in case you are told to evacuate. this kit should also include a pair of goggles and disposable breathing masks for each member of the family. 3. make a family emergency plan. your family may not be together when disaster strikes, so it is important to know how you will contact one another, how you will get back together and what you will do in case of an emergency.
during a volcanic eruption 1. listen to the radio for civil defense advice and follow instructions. if outside at the time of eruption, seek shelter in a car or a building. if caught in volcanic ashfalls, wear a dust mask or use a handkerchief or cloth over your nose and mouth. 2. stay indoors as volcanic ash is a health hazard, especially if you have respiratory difficulties such as asthma or bronchitis. when indoors, close all windows and doors to limit the entry of volcanic ash. place damp towels at thresholds. 3. if you have to go outside use protective gear such as masks and goggles and keep as much of your skin covered as possible. wear eyeglasses, not contact lenses as these can cause corneal abrasions. stay out of designated restricted zones.
after a volcanic eruption 1.listen to your local radio stations for civil defense advice and follow instructions. 2. stay indoors and away from volcanic ashfall areas as much as possible. when it is safe to go outside, keep your gutters and roof clear of ash as heavy ash deposits can collapse your roof. 3. avoid driving in heavy ashfall as it stirs up ash that can clog engines and cause serious abrasion damage to your vehicle. 4. use a mask or a damp cloth and eye protection when cleaning up. moisten the ash with a sprinkler before cleaning.
All waves are generated through disturbance; for example, when a rock is thrown in water or a boat is moved through water. these water waves have mainly two parts that are called crest and trough through which the wave is travelled from one location to other location. each crest is followed by second crest which is again followed by next crest. these crests are separated by a trough to generate a pattern of crests and troughs. in physics, waves are defined as periodical disturbance which are propagated through a particular medium.