jemma's powerpoint!

TORNADO, VOLCANO ERUPTION AND CYCLONE

CYCLONE!!

cyclone• A tropical cyclone is a

storm system characterized by a low-pressure center and numerous thunderstorms that produce strong winds and heavy rain.

Cyclone!!!• he cyclone is accompanied by thunderstorms, and a circulation of winds near the

Earth's surface, which is clockwise in the Southern hemisphere and counter-clockwise in the Northern hemisphere.

• Tropical cyclones are classified into three main groups, tropical depressions, tropical storms, and a third group whose name depends on the region. A tropical depression is an an organized system of clouds and thunderstorms with a defined surface circulation and maximum sustained winds of less than 17 metres a second (33 knot or 38 mph). A tropical storm is an organized system of strong thunderstorms with a defined surface circulation and maximum sustained winds between 17 and 33 metres a second (34-63 knot or 39-73 mph). The term used to describe tropical cyclones with maximum sustained exceeding 33 metres a second, varies depending on region.

• hurricane in the North Atlantic Ocean, North Pacific Ocean east of the dateline, and the South Pacific Ocean east of 160°E

• typhoon in the Northwest Pacific Ocean west of the dateline• severe tropical cyclone in the Southwest Pacific Ocean west of 160°E or Southeast Indian Ocean east

of 90°E• severe cyclonic storm in the North Indian Ocean• tropical cyclone in the Southwest Indian Ocean

VOLCANO ERUPTION

Volcano Eruption!!!• What is the difference between lava and Magma?• Magma is liquid rock inside a volcano.• Lava is liquid rock (magma) that flows out of a volcano. Fresh

lava ranges from 1,300° to 2,200° F (700° to 1,200° C) in temperature and glows red hot to white hot as it flows.

• How many volcanoes are therein the world?• There are around 1510 'active' volcanoes in the world. We

currently know of 80 or more which are under the oceans.