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There is an element without which the earth life cannot survive beyond a few minutes. It forms about half of the earth’s crust and over one-fifth of the air that earth life breathes. Can you name this important element now ?
helium
nitrogen
carbon
oxygen
- Oxygen
- Essential for most life forms; cannot survive without it for a few minutes.
- Makes up about 21% of the Earth’s atmosphere.
- Constitutes around half of the Earth's crust in the form of oxides.
- Helium
- Noble gas, does not support life.
- Very limited presence in Earth’s atmosphere.
- Nitrogen
- Makes up about 78% of the Earth's atmosphere.
- Not directly usable by most life forms in its gaseous state.
- Carbon
- Essential for life and biological molecules.
- Present in trace amounts in the atmosphere.
Correct Answer: Oxygen
By: Parvesh Mehta ProfileResourcesReport error
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