Question

Which two element can destroy the world how

Answer 1

Answer:

Hydrogen

But by chemical means, not relativistic ones. Relativity is LAME.

Hydrogen is highly flammable in oxygen. Luckily, we're living at the bottom of a giant pile of oxygen, so all we need to do is mix in the hydrogen thoroughly and light 'em up.

But how much hydrogen do we need? First, we need to know the formula for combustion of hydrogen: 2H2+O2→2H2O. Now we need to know how much oxygen there is in the atmosphere:

5.15×1018kg∗20.25% O2∗1000mol32.00kg=3.26×1019mol O2

Convert that to the mass of hydrogen:

3.26×1019mol O2 ∗2mol H21mol O2∗2.02kg H21000mol H2=1.32×1017kg H2

So all you need to do is create or find 130 quadrillion metric tons of hydrogen (I recommend collecting it from interstellar space, or synthesizing it from seawater through electrolysis, which would only take 18.6 yottajoules or 1.54 quintillion gallons of gasoline), release it into the atmosphere, and wait for a tiny spark or fire anywhere on the Earth. If something the incredible explosion doesn't kill it, the lack of a single molecule of oxygen anywhere on the planet surely will. And if it survives that, there's a flood of

1.32×1017kg H2∗1000mol H22.02kg H2∗2mol H2O2mol H2∗18.02kg H2O1000mol H2O∗1m3 H2O1000kg H2O=1.17×1015m3 H2O

coming to drown them.