A limitless vacuum also called the 'universe'
The vast surrounding space is called universe. The universe contains everything that exists wherever it may be. The most distant stars, satellites and our earth are the part of the universe.
SOLAR SYSTEM
* The sun with all its planets together make a family. This family is called as the solar system.
* The planets, their satellites and a large number of other heavenly bodies moving round the sun taken together from the solar system.
* The sun is situated in the centre of the solar system.
Q. How many planets has the solar system?
Ans: The solar system has 9 planets.
They are Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury and Pluto.
Q. Which is the smallest and largest planet?
Ans: Jupiter is the largest planet and Pluto is the smallest planet.
Q. Which planet is the nearest to the earth?
Ans: Mars is the nearest planet to the earth.
Q. Which is the nearest planet / farthest planet from the sun?
Ans: In the solar system the planet nearest to the sun is mercury and the planet farthest from the sun is Neptune.
Q. Which is the most signing planet?
Ans: Venus is the most signing planet.
Q. What is rotation?
Ans: Rotation is the turning around of the earth on its axis from west to east.
Q. What is revolution?
Ans: The movement of the earth around the Sun is called its revolution.
Q. What is axis?
Ans: Axis is the imaginary line passing through the centre of the earth on which its rotates.
Q. What is orbit?
Ans: Orbit is the imaginary path on which the earth moves revolving around the sun.]
Q. What are satellites?
Ans: Similar heavenly bodies revolve round the planets. They are called satellites.
Q. What is longitude?
Ans: Longitude is the distance of the place east or west of the Greenwich meridian measured in Degrees.
Q. What is a latitude?
Ans: Latitude is the distance of a place North or South of the equator.
OUR EARTH
Q.What is solar eclipse?
Ans: Solar eclipse occurs when the moon comes in between the sun and earth.
Q. What is lunar eclipse?
Ans: Lunar eclipse occurs when the earth comes in between the sun and the moon?
OUR EARTH
* The earth is one of the 8 planets revolves around the sun. Among them only earth has life on it. That's why earth is called a unique planet.
* What is rotation?
Ans: Rotation is the turning around of the earth on its axis from west to east.
Q. What is revolution?
Ans: The movement of the earth around the Sun is called its revolution.
Q. What is axis?
Ans: Axis is the imaginary line passing through the centre of the earth on which its rotates.
Q. What is orbit?
Ans: Orbit is the imaginary path on which the earth moves revolving around the sun.
Q. What is longitude?
Ans: Longitude is the distance of the place east or west of the Greenwich meridian measured in Degrees.
Q. What is a latitude?
Ans: Latitude is the distance of a place North or South of the equator.
Q. What is lithosphere?
Ans: The hard crust of the earth on which we live is called lithosphere.
Q. What is the hydrosphere?
Ans: The water portion on the earth covering seas and ocean is called hydrosphere.
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* The surface of the earth can be divided mainly into two parts. One is water and another is land. Approximately 3/4 part of the earth is water and 1/4 part is land.
* The hug expand of water on the earth is called ocean.
* The land on the earth is divided into many big parts. The very big parts of the land are called continents.
Q. What is an ocean?
Ans: it is a natural division of fast area of water on the earth.
Q. How many oceans are there on the earth and what are they?
Ans: There are five oceans on this earth. They are Pacific ocean, Atlantic ocean, Indian ocean, Southern /Antartic ocean and Artic ocean.
Q. How many continents are there on the earth?
Ans: there are 7 continents on the earth they are Asia, Europe, North America, South America, Antarctica, Africa and Australia.
Q. What is around the earth ?
Ans: There is air around the earth.
Q. What is a lake?
Ans: A large area of water surrounded by land
is called a lake.
Q. What is an island ?
Ans: The area of land surrounded by water from all sides is called an island.
Q. What is a desert ?
Ans: A vast area of land covered with sand is called desert.
Q. What is delta?
Ans: A triangular piece of land at the mouth of river is called delta.
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