The element you're referring to is oxygen. Oxygen is a vital component of the human body, making up a significant portion of the body's weight due to its presence in water, proteins, carbohydrates, and fats. Additionally, oxygen is a major component of Earth's crust, forming minerals and rocks. The most abundant minerals on Earth, like silicates, also contain oxygen. So, oxygen plays a crucial role both in the composition of the human body and the Earth's crust.