bg

10 most difficult geology riddles

A list of ten (out of 63) geology related questions that are the most often answered incorrectly
Geology quiz
What is the most common element (by mass) forming the planet Earth?
carbon
oxygen
iron
silicon
Iron is most abundant in the Earth's outer and inner core, and it is the fourth most common element in the Earth's crust.
globalquiz.org
Correct this question
0
Correct this question
0
Very interesting!
elements riddles
Play and see more questions
Geology quiz