1. Silicon is present in the largest amount in terms of percentage by mass in the earth’s crust.
2. The earth the atmosphere consists of 21% oxygen and 78 % nitrogen.
3. The Earth revolves around the sun in an elliptical orbit. Its speed is greatest when it is closest to the sun.
4. The core of the earth is Metallic.
5. Atmospheric pressure exerted on earth is due to Gravitational pull of the earth.

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