18. what is the most abundant element in the earths crust? the second most abundant element?
18. what is the most abundant element in the earths crust? the second most abundant element?
Answer
Brief Explanations:
Oxygen is the most abundant element in the Earth's crust, making up about 46.6% by mass. Silicon is the second - most abundant element, accounting for about 27.7% by mass.
Answer:
The most abundant element is oxygen. The second - most abundant element is silicon.