What if earth lost Oxygen for few seconds ?

SEA DISAPPEARS

The oceans would evaporate and bleed into space. As oxygen disappears from the oceans' water, the hydrogen component becomes an unbound free gas.

BUILDINGS COLLAPSE

Oxygen is an important binder in concrete structures, and without it the compounds do not hold their rigidity.

DARK SKY

When that part of Earth is facing away from the Sun, space looks black because there is no nearby bright source of light, like the Sun, to be scattered.The same phenomena is what happening on the Moon, which has no atmosphere, the sky would be black both night and day.