What is the most abundant compound on the Earth?

Question

What is the most abundant compound on the Earth?

Answer 1

Hatred of jews

Answer 2

2 parts Hydrogen to 1 Part Oxygen

You Guessed it, Water

Answer 3

water

Answer 4

this lists the top ten it the crust. i think water might have everything beat.

Answer 5

The most abundant compound is silicon dioxide - sand or quartz.  Since the iron in the core is an element, that doesn't count and we can't get at it anyway.

Answer 6

Water (H2O) is the most abundant compound *ON* the Earth.

But while I'm answering, here are free (!) bonus answers:

Silicon dioxide (SiO2) is the most abundant compound *IN* Earth's crust (what's below that has not been accurately quantified, only estimated).

Cellulose (a bunch of C, H, and O atoms) is the most abundant biologic compound on our planet.

Diatomic nitrogen (N2) is the most abundant compound in the atmosphere.