There's multiple reasons for the changes of seasons on the Earth, the most important being the elliptical orbit of the Earth around the Sun, its inclination, and the angle by which the Sun's rays are falling on the Earth.
Because the Earth's orbit is elliptical, in certain parts of the year it is closer to the Sun, and in certain parts of the year it is further from the Sun. When the Earth is closer to the Sun, it speed increases slightly, and that makes the Earth cooler, and when it is further from Sun, its speed decreases by little, and the Earth is warmer.
The inclination of the year allows for one half of the planet to get more Sun light in one part of the year, and the other half to get less, while in the other part of the year, the half that was getting less Sun light gets more, while the one that was getting more is getting less.
The angle of the Sun's rays is directly connected to the inclination of the Earth and its shape. The parts that get the Sun's rays at an angle of 90 degrees or close to that are warmer, and as the angle is becoming smaller and smaller the parts of the Earth become colder and colder because the rays are dispersing over a much larger area.
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Explanation:
Early Indians: The Story of Our Ancestors and Where We Came From" looks at how and when modern humans first arrived in India; what evidence they left behind; who their descendants are today; who else followed them as migrants to this land; how and when farming started and the world's largest civilisation of its time was built; when and why this civilisation declined; and what happened next. The first modern humans arrived in India around 65,000 years ago as part of an Out of Africa migration that populated the entire world ultimately. The genetic lineage of these first migrants that the book calls ‘First Indians' still dominate the Indian population and accounts for 50-65 per cent of the Indian ancestry today.
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They live in areas that they can get resources from.
Explanation:
For example food, shelter, etc.
The sky is blue because blue light is scattered in all directions by the tiny molecules of air in Earth's atmosphere. Blue is scattered more than other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.