Plentiful, Copious
Hydrogen and helium are the most abundant elements in stars.
Assuming the question is for computers, on Excel go to Edit then click on Replace. A box appears with Find what: Replace with: so fill in those two boxes then click on Replace.
The two most abundant resources of Eastern Central Europe are coal and forests.
An apostrophe.
The two most abundant gases in the Earth's atmosphere are nitrogen (about 78%) and oxygen (about 21%).
redundant, abundant
hydrogen and oxygen
The two most abundant gases in Earth's atmosphere are nitrogen (about 78%) and oxygen (about 21%).
Ionized hydrogen and helium are the most abundant chemical elements in nebulae.
The most abundant is nitrogen at 78% followed by oxygen at 21%
Oxygen and silicon are the two most abundant elements in the Earth's crust. They make up about 75% of the Earth's crust by weight.
The most abundant element in the Earth's crust is oxygen at 46%. The second is silicon at 28%.