which of the following element are found in the Earths crust?
iron
oxygen
calcium
all of the above
#26
All of them.
thanks
I should point out that none of them are in their free state. For example, you won't find oxygen gas but you will find it as oxides (iron oxide, calcium oxide, etc).
To determine which elements are found in the Earth's crust, we can refer to scientific knowledge and data. The Earth's crust is the thin outermost layer of the Earth, and it contains a wide variety of elements.
Iron (Fe) is indeed found in the Earth's crust. It is one of the most abundant elements, making up about 5% of the Earth's crust.
Oxygen (O) is also found in the Earth's crust. In fact, oxygen is the most abundant element in the Earth's crust, accounting for about 46.6% of its composition.
Calcium (Ca) is another element that is found in the Earth's crust. It is quite common, making up around 3% of the Earth's crust.
Therefore, in this case, the correct answer is "all of the above" because all three elements mentioned (iron, oxygen, and calcium) are found in the Earth's crust.