Question

If most of the things are made by carbon then why we say that carbon is present in less amount on earth crust.

Answer 1

Answer:

carbon is everywhere” — well, in our lives, actually ‘life’, it is, because ‘life’ concentrates it (cf. organic chemistry) — but there’s actually not all that much of it. The reason has to do with the formation of elements in the fusion reactions in stars (and novae): carbon gets fused to neon, then oxygen, then silicon, then a radioactive form of nickel which decays to iron. This illustrates why a HUGE portion of the earth’s crust is made up of oxygen, silicon, etc. (you might be familiar with that in the form of things like water, air, and rocks) - and why the earth’s core is more or less a big ball of molten spinning iron (hence why compasses work).

Carbon may seem to be ‘everywhere’ in the life-stuff on top of the earth’s crust - but there really ain’t all that much of it in the actual crust.