The most abundant element on Earth is oxygen, but the most abundant element in the entire universe is hydrogen. On Earth, oxygen makes up approximately 47 percent of the Earth's mass and is found both in Earth's atmosphere and crust.
On Earth, oxygen and silicon are the two most abundant elements, with silicon only found in the Earth's crust.
The Earth's crust mostly consists of silicon, aluminum, iron, calcium, sodium, potassium and magnesium. All these elements are present in igneous rocks throughout the Earth.
The elements that make up Earth are quite dissimilar to those that give the human body life. Nitrogen is extremely rare on Earth, but it is largely responsible for the proteins that are the building blocks of life.