Презентация на тему Natural disasters

air that extends from a thunderstorm cloud to the

ground. As the wind is invisible, you can not always see a tornado. Visible sign - funnel consisting of water droplets, sometimes items throughout its existence tornadoes are not always in contact with the ground. Dust and debris in a rotating funnel also make a tornado visible and indicate the position of the tornado.

disaster.

surface hot debris, ash outpouring of magma, which izlivshis

on the surface, it becomes lava. Eruption may have a time period ranging from several hours to many years.

not counting submarines. Of these, only 20-30 erupt each

year.

surface due to natural causes, among which the main

role belongs to tectonic processes (mass transfer inside the Earth). It is a common phenomenon observed in many areas of continents and on the ocean floor.

of geological problems, but sometimes they can be caused

by landslides, explosions in mines, nuclear tests and volcanic activity.

water levels in the river, lake or sea during

snowmelt, rainfall, wind surges, with traffic jams, ice jams, etc.

economy floods and other water-related disasters, ranging from 50

to 60 billion U.S. dollars.

formed on the surface of the earth, sidewalks, roadway

and on objects (trees, wires, etc.) when freezing of supercooled rain and drizzle (fog)