Domains of the Earth
Q36. How many continents are
there on the earth? Name them.
There are seven major continents separated by large water bodies. These continents
are – Asia, Europe, Africa, North America, South America, Australia and Antarctica.
Q37. Write is
the main reason of air pollution.
from industries, thermal power plants and vehicles, pollutes the air. Carbon
dioxide (CO2) is an important constituent of air but increase in the
amount of CO2 leads to global warming.
Q38. What is
‘Atmosphere’? Why atmosphere is so important?
The earth is surrounded by a layer of gas called the atmosphere. This thin
blanket of air is an integral and important aspect of the planet. It provides
us with the air we breathe and protects us from the harmful effects of sun’s
Q39. Why do
mountaineers carry oxygen cylinders with them?
The climbers experience problems in breathing as density of air decreases
rapidly as we go up. That’s why they carry oxygen cylinders with them to be
able to breathe at high altitudes.
Q40. Write a short note on the continent – Antarctica.
completely in the Southern Hemisphere, is a huge continent. The South Pole lies
almost at the centre of this continent. As it is located in the South Polar
Region, it is permanently covered with thick ice sheets. There are no permanent
human settlements. Many countries have research stations in Antarctica.
Q41. What is the height of the Mt Everest? Who were the first
men to climb the highest mountain peak Mt. Everest on the planet earth on 29th
highest mountain peak Mt. Everest is 8,848 metres above the sea level. Edmund
Hillary (New Zealand) and Tenzing Norgay Sherpa (India) were the first men to
climb the highest mountain peak Mt. Everest on the planet earth on 29th May,
Q42. Write about Pacific Ocean.
The Pacific Ocean is the largest ocean. It is spread over one-third of the
earth. Mariana Trench, the deepest part of the earth, lies under the Pacific
Ocean. The Pacific Ocean is circular in shape. Asia, Australia, North and South
Americas surround it.