Uddrag fra opgaven
English Exam Tornadoes/Cyclones; Twisters are born in thunderstorms and are often accompanied by hail. Giant, persistent thunderstorms called supercells spawn the most destructive tornadoes. A tornado forms when changes in wind speed and direction create a horizontal spinning effect within a storm cell. This effect is then tipped vertical by rising air moving up through the thunderclouds. Tornadoes' distinctive funnel clouds are actually transparent. They become visible when water droplets pulled from a storm's moist air condense or when dust and debris are taken up. Tornadoes are classified as weak, strong, or violent storms. Violent tornadoes comprise only about two
Få fri adgang for at læse hele teksten og downloade ubegrænset.
Få fri adgang