What elements is the earth made up of
- What elements is the earth's crust made up of
- What elements is the earth surface made up of
- What 2 elements is earth's atmosphere mostly made up of
- Which elements is the earth's core made up of
- What percentage of the earth is made up of elements other than hydrogen and helium
- What percentage of the earth is made up of these other elements
- The earth's atmosphere is mainly made up of what three elements