9th Class Social
Chapter : Our Earth
Date : 22/06/2021 Day : Tuesday
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Environmental Crises : The Human activities such as polluting the soil by using chemical fertilizers, polluting the river by dumbing wastage, polluting the air by sending excess amount of poisonous gases such as CO2, CO, CH4 ( Methane ) etc which lead to global warming. These reckless exploitation of earth by humans are called Environmental Crises.
Write some ways to protect our Earth.
We can protect our Earth by the following ways....
01. Stop deforestation and encourage afforestation.
02. Reduce the usage of fossil fuels.
03. Should ban plastics.
04. Reduce the usage of Automobiles.
05. Should practice Organic farming instead of Inorganic in Agriculture.
06. Should ban sending Industrial wastage to the river.
07. Reduce the usage of AC , Refrigerator etc which release CH4 gas.
08. Government should introduce many schemes such as Swachh Bharath, Haritha Haram etc for protecting Environment.
09. Should impose criminal activities on those who exploit environment
10. Should create awareness among the people about the importance of environment through poster, drama etc
11. There should be proper solid waste management in each towns & cities.
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Date : 24/06/2021 Day : Tuesday
Cluster : Million groups of Galaxy are called cluster
Galaxy : Millions of stars together called Galaxy.
Milkyway : The Galaxy in which the star, 'sun' and all other planets belongs including our Earth.
Nebulae : The swirling dust and clouds in the Universe.
Molten : Semi solid and liquid like lava.
Name the Indian books of 3500 years ago which give lot of information about Universe.
Ans : Surya Sidhanta, Vedanga Jyotisha, Bhagavata Purana
Geocentric theory : 1000 of years ago Ptolemy proposed that Earth is at center and all the planets along with sun revolve around the earth which is called as Geocentric theory.
Heliocentric theory : 500 years ago the scientist Copernicus came with a new idea that Sun is at center and all the planets along with earth revolve around the Sun which is called as Heliocentric theory.
Orbit : The path of the Earth around the Sun
What is the Orbital shape of the Earth ?
Ans : A scaled Oval path.
Rotation : Earth rotates on its axis, It causes day & night
Revolution : Earth revolve around the sun. It causes changes in the season
What is the speed and duration of the earth around the sun ?
Ans : Earth travels around the sun at a speed of 107200 km/hr and It takes 365 days and 6 hours to complete one revolution.
Date : 25/06/2021 Day : Friday
Explain the Internal Structure of the Earth.
Answer :
Date : 06/07/2021 Day : Tuesday
Difference between Latitudes & longitudes
Answer :
