1. Answer the following questions briefly.
(a) What are the four major domains of the earth?
Answer:
The following are four domain of the earth:
- Lithosphere [Land]
- Hydrosphere[water]
- Atmosphere[Air]
- Bioshphere[Living Orgnaism]
(b) Name the major continents of the earth.
Answer:
The following are the major continents of the earth in the decreasing order of size:
- Asia[largest]
- Africa
- North America
- South America
- Antarctica
- Europe
- Australia[Smallest]
(c) Name the two continents that lie entirely in the Southern Hemisphere.
Answer:
- Australia and Antactica
(d) Name the different layers of the atmosphere.
Answer:
The following are the different layer of the atmosphere starting from the earth surface:
- Troposphere
- Stratosphere
- Mesosphere
- Ionosphere or Thermosphere
- Exosphere
(e) Why is the earth called the ‘blue planet’?
Answer:
- Earth is called a blue planet because more than 79 % of the earth's surface is covered by water.
(f) Why is the Northern Hemisphere called the Land Hemisphere?
Answer:
- Because land is more extensively found in the northern hemisphere than the southern hemisphere; that is why the northern hemisphere is called the land hemisphere.
(g) Why is the Biosphere important for living organisms?
Answer:
- The biosphere is the meeting zone of air, water, and land. It provides everything that any organism needs to survive. Hence, it is very important to living organisms.
2. Tick the correct answers.
(a) The mountain range that separates Europe from Asia is
(i) the Andes (ii) the Himalayas (iii) the Urals
Answer:
- iii. the Urals
(b) The continent of North America is linked to South America by
(i) an Isthmus (ii) a Strait (iii) a Canal
Answer:
- i. an Isthmus
(c) The major constituent of the atmosphere by percent is
(i) Nitrogen (ii) Oxygen (iii) Carbon dioxide
Answer:
- i. Nitrogen
(d) The domain of the earth consisting of solid rocks is
(i) the Atmosphere (ii) the Hydrosphere (iii) the Lithosphere
Answer:
- iii. the Lithosphere
(e) Which is the largest continent?
(i) Africa (ii) Asia (iii) Australia
Answer:
- ii. Asia
3. Fill in the blanks.
(a) The deepest point on the earth is ____Mariana trench_________ in the Pacific Ocean.
(b) The _________Indian____ Ocean is named after a country.
(c) The ________Biosphere_____ is a narrow contact zone of land, water and air that
supports life.
(d) The continents of Europe and Asia together are known as ___Eurasia__________.
(e) The highest mountain peak on the earth is ___Mount Everest__________
ConversionConversion EmoticonEmoticon