CLASS 6 / GEOGRAPHY / LESSON 1 (Q/A)
Chapter 1
The Earth in the Solar System
I. Answer the following questions briefly.
1. How does a planet differ from a star?
|
PLANET |
STAR |
|
A planet does not have its own light and heat. It derives its light
from a star |
A star possesses its own heat and light. |
|
A planet is usually smaller than stars. |
Stars are very huge objects compared to a planet in general. |
2. What is meant by the ‘Solar System’?
The
term Solar System refers to the “family” of the Sun. The Sun is a star around
which eight planets, among other celestial objects, revolve in orbits. This
whole system of bodies is called the Solar System. The Sun is the “head” of
this system.
3. Name all the planets according to
their distance from the sun.
The
list of planets in the order of their distance from the Sun is as follows:
|
1. Mercury 2. Venus 3. Earth 4. Mars 5. Jupitar 6. Saturn 7. Uranus 8. Neptune |
4. Why the Earth is called a unique planet?
The Earth is regarded as a unique
planet because of the following reasons:
a. It is the only planet known to
support life. It has oxygen and water present in proportions that allow life to
thrive.
b. It also has a temperature range that
supports life.
c. The proportion of water present is about
two-thirds of the surface of the earth when compared to land.
5. Why do we see only one side of the
moon always?
One
revolution of the moon around the earth takes about 27 days. Incidentally, the
moon’s rotation about its own axis also takes nearly the same time. One day of
the moon is equal to 27 Earth days. So only one side of the moon can be seen
from the earth.
The
Universe is the largest unit in which we live. It is a collection of galaxies.
There is only one Universe and everything that exists in this Universe itself.
The moon is seen in its two extreme
shapes on the Full Moon night arid the New Moon night. The Full Moon. The Full
Moon means the moon in its full circular shape. The New Moon. The New Moon
means the moon that can not be a seer. The New Moon occurs on the fifteenth day
and the Full Moon occurs on the last day of the Hindi calendar month.
The Pole Star is the star that is known
to retain its position in the sky always. We can locate the position of the
Pole Star with the help of the constellation Saptarishi. If an imaginary line
is drawn joining the “pointer stars” of the Saptarishi and extended further, it
will point to the Pole Star.
The earth has conditions that support
life. It is neither too hot nor too cold. It has both water and air, which are
both indispensable for life. Presence of oxygen in the air in an appropriate
proportion supports life. These factors make the earth a unique planet.
10.
Write short notes
on the following:
a.
The sun
The sun is
considered the “head” of the solar system. It is a star, although it is smaller
and less bright than most other stars. It is a huge celestial body made up of
extremely hot gases. It provides heat and light for the whole of the solar
system. Life on earth depends on many factors, and the sunlight is one of them.
The sun is about 150 million kilometers away from the earth.
b. The moon
The moon is the only natural satellite of our planet earth. Its diameter is just about a quarter of the earth’s diameter. It is comparatively closer (3,84,400 kilometres away) to earth than all other celestial bodies. It does not support life. It revolves around the earth and rotates about its own axis in about the same time, due to which only one side of the moon is visible to us.
c. Galaxy.
Galaxy is a term that refers to
billions of stars, clouds of dust and gases, and other celestial bodies
considered as a single unit. The only bigger unit in the universe, galaxies
make up the universe. The galaxy we live in is called the Milky Way.
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