Major Elements:
* Oxygen (O): The most abundant element, making up around 43% of the lunar surface.
* Silicon (Si): The second most abundant, comprising roughly 20%.
* Iron (Fe): Around 5% of the lunar surface.
* Magnesium (Mg): Around 4% of the lunar surface.
* Calcium (Ca): Around 3% of the lunar surface.
* Aluminum (Al): Around 3% of the lunar surface.
Minor Elements:
* Titanium (Ti): A relatively high concentration compared to Earth's crust.
* Sodium (Na): Found in significant quantities, especially in the lunar highlands.
* Potassium (K): Present in moderate amounts.
* Phosphorus (P): Found in smaller quantities.
* Manganese (Mn): Found in trace amounts.
* Chromium (Cr): Found in trace amounts.
Trace Elements:
* Rare Earth Elements (REE): Found in very small amounts, but their ratios vary significantly across the lunar surface.
* Uranium (U): Present in trace amounts.
* Thorium (Th): Present in trace amounts.
* Other elements: Various other elements are found in very small amounts.
Differences from Earth Rocks:
* Lower abundance of volatile elements: Moon rocks have much lower concentrations of volatile elements like hydrogen, helium, carbon, and nitrogen compared to Earth rocks. This is due to the Moon's low gravity and lack of an atmosphere, which allowed these elements to escape.
* Higher iron content: Moon rocks have a higher iron content than Earth rocks, especially in the form of iron oxide (FeO).
* Higher titanium content: The Moon's crust is rich in titanium, particularly in the form of ilmenite (FeTiO3).
* Lower water content: Moon rocks are very dry, containing only trace amounts of water.
Important Note: The elemental composition of moon rocks varies depending on their location and origin. The lunar highlands, maria, and regolith all have unique compositions.
