World Geography
Which among the following statements is/are correct about the Thermosphere?It lies upto an altitude of 80 km from the earth’s surface.It contains electrically charged particles known as ions.The temperature here starts increasing with heights.The International Space Station and other satellites orbit in this layer.Select the correct code from the options given below:

Only 2, 3 & 4
Only 3 & 4
1, 2, 3 & 4
Only 1, 3 & 4

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World Geography
Which among the following period in the demographic history of India is called the Period of Stable Population?

1921 to 1951
1891 to 1921
1981 to Present
1951 to 1981

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