Page 147 - SST Class 06

TECTONIC PLATES & RING OF FIRE

Arctic Circle

Eurasian Plate
Adriatic
Plate
Turkish
North American Plate Plate China Plate
Aegean
Plate
Tropic of Cancer Arabian
Plate
Philippine
Plate
Caribbean
Pacific Plate Pacific
Plate Plate
Cocos African Plate
Plate
Equator
Fiji
Plate
Nazca South American
Plate Plate
Tropic of Capricorn Australian
Plate

Antarctic Plate

The ring of fire is the name for the area around the Pacific Ocean
Divergent boundaries Plate movement SEA DEPTH IN METRES where many of the world's volcanoes are found. Besides volcanoes,
Subduction zones Ring of fire 0 2000 4000 6000 8000 there are also more earthquakes in the Ring of Fire than the rest of
Conservative plate Volcano the world. Many islands, like the Hawaiian Islands, are formed from
volcanoes.
marine or submarine relief. They each have together as a single massive landmass called
different physical features, shapes and sizes. We Pangaea. But, thanks to plate tectonics, they
are concerned here with only continental relief or gradually broke apart and separated. Europe and
landforms. North America are still moving apart at the rate
CONTINENTS of 7 cm every year, research says.
The total landmass on the earth is formed of The widely recognised all the 7 continents are
seven continents of various sizes. Some are listed by size below, from biggest to smallest.
connected to each other while others are not. All g Asia : It includes 50 countries and it is the
of them have a different number of countries most populated continent, the 60% of the
forming them. total population of the earth live here.

The names of the seven continents of the world g Africa : It comprises 54 countries. It is the
are— Asia, Africa, Europe, Australia, North hottest continent and home of the world’s
America, South America and Antarctica. largest desert, the Sahara, occupying the
All the continents of the world start and end with 25% of the total area of Africa.
the same alphabet if you consider North and g North America : It includes 23 countries
South Americas as one continent. led by the USA as the largest economy in
The earth is around 71 percent water and the world.
29 percent land. In fact, billions of years ago, the g South America : It comprises 12 coun-
seven continents of the world were joined tries. Here is the largest forest, the Amazon

Social Science-6 147