ICSE-IX-Geography
01: Earth as a Planet
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- #Earth as a Planet Class 9 Geography Voyage
- #Section : IShort Answer
- Qstn #1How can you prove that the earth is a sphere by looking at the Pole Star?Ans : The Pole Star can be seen at an angle of 90° at the North Pole, as it lies directly at the line of axis of the earth, while its angle decreases towards the Equator i.e. it is 0° at the equator. It is only possible in an quarter arc of a circle. It proves that the earth is a sphere with circular surface.
- Qstn #2Briefly describe the shape of the earth.Ans : The earth has got a spherical shape, slightly bulging at the equator and flattened at the poles. The spherical shape is confirmed by the arrival of a ship seen first by its mast and later on the ship. The satellite picture of the earth, shadow of the earth on the moon as circular, and the views of circular horizons from the height etc. all these prove the spherical shape of the earth.
- Qstn #3What is the earth’s mean temperature ? State its one advantage.Ans : The earth’s mean temperature is 17° C, which is ideal to support the survival of the life system.
- Qstn #4Why is the earth called a watery planet ?Ans : The earth is called a watery planet, as its major part i.e. 70% is covered by water or hydrosphere. The earth is seen blue in the satellite pictures due to the majority of water.
- Qstn #5What is ‘biosphere’ ?Ans : Biosphere is the narrow zone of contact amidst lithosphere, hydrosphere and atmosphere.
- Qstn #6Name the conditions necessary for life on earth.Ans : The conditions necessary for life on earth, are ideal temperature range with an average between 10°C and 35°C, solar radiation, humidity, wind, water, land etc.
- Qstn #7Give any two features of the earth that make it a ‘Unique Planet’.Ans : The earth is so for the only planet which consists of life- system. It is due to its ideal average temperature of 17°C to support the life and provide with atmosphere and hydrosphere to impart air and water essential for life.
- Qstn #8Why is the planet Venus hotter than the planet Mercury?Ans : Venus is hotter than Mercury because the atmosphere around Venus is mainly composed of carbon dioxide. The carbon dioxide produces Greenhouse effect on the surface of Venus. Thus, the tempreature on its surface remain very high.
- Qstn #9Name the two sources of heat in the interior of the earth.Ans : Two sources of heat in the interior of the earth are:
- the radioactive elements trapped inside
- the immense temperature and pressure in the deep interior.
- Qstn #10What is meant by Terrestrial Life ?Ans : On the surface of the earth, there are continents and oceans. The life on the continents or on land is called ‘Terrestrial Life’.
- Qstn #11Name the members of the Solar System.Ans : Members of the solar system includes the Sun and everything that orbits it like planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn,.Uranus and Neptune), their satellites, asteroids, comets, interplanetary gas and dust.
- Qstn #13What is meant by Inner Planets ? Name them.Ans : The planets that lie within the asteroid belt that is Mercury, Venus, Earth and Mars are called the inner planets.