Hydrosphere is made up of water, salt and others so that why i'm giving you this.....(remember water is made up of oxygen and hydrogen,common salt is made up of sodium and chlorine)
Hydrogen
calcium is!
goyttret
Oxygen is the most abundant element in Earth's crust.
Hydrogen is the most common element in the universe, and in the Sun.
Hydrogen
I believe it is Hydrogen
calcium is!
The second most abundant element in the Earth's crust is silicon, comprising 27.8% of the crust by mass.
silicon
Aluminum 7.5 to 8.1%
Siliconsilicon at 28%silicon!
goyttret
That would be silicon, or SiO2
The most abundant metal in the earth crust is aluminium.
aluminum
silicon.