2000 BC and was found in tubes in Egyptian tombs dated from 1500BC
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Answer:

Explanation:
Hello!
In this case, for the undergoing chemical reaction:

We evaluate the yielded moles of zinc hydroxide by each reactant as shown below:

In such a way, since the water yields a smaller amount of zinc hydroxide we conclude it is the limiting reactant so the maximum mass is computed below:

Because the water limits the yielded amount of zinc hydroxide.
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O2 gas, where there are two Oxygen atoms which are covalently bonded together
Answer:
Oceanic & Continental Plates
The oceanic plate is denser and sinks due to its lower buoyancy. It's sucked into the asthenosphere and is melted deeper into the Earth, called a subduction zone. The continental plate is less dense and floats over the top of it since it is more buoyant