Tomi is here for you again
According to Chemistry, there're 118 number of elements possible on Earth. But the Earth mostly made of Iron, Oxygen, Silicon and Magnesium . If we could able to separate the Earth out into piles of materials, we would get 32.1% Iron, 30.1% Oxygen, 15.1% Silicon and 13.9% Magnesium. If we could actually get down and sampled the core of the Earth it would be 88% Iron. That means, most of the Iron located at the Earth’s core. And we'd find the 47% of Earth’s crust is Oxygen if we sampled it.
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Remember that each day, the Sun moves about 1° compared to the background stars - about the size of Moon in the sky. So, if we add up this little motion from the Sun that we see since the Earth is orbiting around it as well as the rotation on its axis, we get a total 24 hours. This is known as Solar Day - is the amount of the Sun takes to return to the same place in the sky.
We were learnt in our childhood that a day is 24 hours, but the Earth doesn't take 24 hours to complete the rotation on its axis & actually takes 23 hours, 56 minutes & 4 seconds. Which is referred a Sidereal Day by astronomers. Now what about the 4 seconds ? You may think that the time would add up , day-by-day, and within a few months day would be night and night would be day.