The most abundant element in earth's crust is

Options

A. Nitrogen
B. Oxygen
C. Iron
D. Magnesium

Answer

**Step-by-Step Solution:**

1. **Understanding Earth's Crust Composition**: The Earth's crust is made up of various elements that are present in different proportions. To determine the most abundant element, we need to look at the composition of these elements.

2. **Identifying the Most Abundant Element**: Among the elements found in the Earth's crust, oxygen is the most abundant. It constitutes approximately 46.6% of the Earth's crust by weight.

3. **Listing Other Abundant Elements**: After oxygen, the next most abundant elements in the Earth's crust are:
- Silicon (approximately 27.7%)
- Aluminum (approximately 8.1%)
- Iron (approximately 5%)

4. **Conclusion**: Based on the abundance levels, the most abundant element in the Earth's crust is oxygen.

**Final Answer**: The most abundant element in Earth's crust is oxygen.

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