Very probable these compounds are water and silicon dioxide (in the Earth crust).
The most common charge for alkaline earth metals is +2. This is because they have 2 valence electrons, which they tend to lose to achieve a stable octet electron configuration.
In the earth crust: silicon, aluminium, oxygen.
The hot subtropical desert is the most common type of deserts. They account for about 2/3 of the deserts on earth.
maybe land?, water? must be one of those 2
2-propylpentanoic acid
Silicon and aluminium. In both cases accompanied by Oxygen.
Quartz and feldspars are the most common silicate minerals of the crust.
The valency of manganese is typically +2 or +3. The chemical formula for the most common compound, manganese oxide, is MnO2.
The two most common gases in Earth's atmosphere are nitrogen, which makes up about 78%, and oxygen, which makes up about 21%.
Water or H2O
What is the COMPOUND????? However, think of oxygen as the standard at '-2' for most compounds.
Nitrogen and Oxagen