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Potassium is the answer. Below are the 8 most common elements in Earth's crust (by mass):

46.6% Oxygen (O)

27.7% Silicon (Si)

8.1% Aluminum (Al)

5.0% Iron (Fe)

3.6% Calcium (Ca)

2.8% Sodium (Na)

2.6% Potassium (K)

2.1% Magnesium (Mg)

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