CHAPTER-13-
THE EARTH IN THE SOLAR SYSTEM
Q.1-Brifly defines universe and galaxy?
An- the universe is the boundless expanse in which matter
star, planets, satellites, etc, exist.
Many groups of stars were formed which we call galaxies.
Q.2- what do you understand by solar system?
An- A solar system that house, planet, moon, stars, comets,
asteroids, and other have bodies.
Q.3- defines the term constellations?
Ans-A group of stars the form a recognizable pattern in the
sky.
Q.4- what according to you makes the planet earth unique?
Ans- the earth is unique planet in the solar system because
it supports life.
Qu5.- what is an asteroid ?
Ans-pieces of rocks found orbiting the sun in a belt between
Mars &Jupiter.
Long answer
Q.6- How is a comet different from an asteroid?
Ans- Comet-Balls of dust , ice particles and frozen gases
visit our solar system in a periodic manner.
Asteroid- pieces of rocks found orbiting the sun in a belt
between Mars &Jupiter
Qu.7-Explain what you understand by the waxing and waning of
the moon.
Ans- the term refers
to the different shapes of the moon you have just read that the moon takes
about 28 days to go around the earth the shape of the moon grows during one half of this period , which
is called the waxing period. And reduces during the other half which is called
waning period.
Q.8-Explain what a meteorite is?
Ans- Meteors – piecesof rocks that enter the earth’s
atmosphere and generally burn out to friction with the earth’s atmosphere.
Q.9- Why is the earth a unique planet?
Ans-the earth is a unique planet in the solar system because
it supports life. This is possible because of the following reasons
1- About 3/4th of the surface of the earth is
covered with water and that is why it is also referred to as the watery or blue
planet.
2-The earth’s atmosphere has adequate amount of oxygen,
which we breathe
Gases-nitrogen ,carbon dioxide and some others that are
present In small amount in the
atmosphere- are critical for life on earth , ozone in the atmosphere protects us from the harmful ultraviolet rays
of the sun .
The land has sol that supports plant life and other living
thing.
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