* Trace elements: These are elements that occur in very small amounts, often less than 0.1% of the crust. Examples include gold, platinum, uranium, and mercury.
* Rare earth elements: These are a group of 17 elements with similar chemical properties. They are found in small amounts in the Earth's crust and are often used in high-tech applications.
It's important to note that the exact percentage of each element can vary slightly depending on the specific location and geological formations. However, the vast majority of the Earth's crust is made up of a few key elements:
* Oxygen (46.6%)
* Silicon (27.7%)
* Aluminum (8.1%)
* Iron (5.0%)
* Calcium (3.6%)
* Sodium (2.8%)
* Potassium (2.6%)
* Magnesium (2.1%)
These eight elements account for over 99% of the Earth's crust.
