3. • A tropical cyclone is a storm system
characterized by a low-pressure center and
numerous thunderstorms that produce strong
winds and heavy rain.

5. • 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

6. VOLCANO
ERUPTION

7. • 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 there in the world?
• There are around 1510 'active' volcanoes in the world. We
currently know of 80 or more which are under the oceans.