1. Volatile elements (Na, K):
- The Earth's crust and mantle have higher abundances of volatile elements like Na and K compared to the Moon.
- This suggests that the Moon has experienced greater depletion of these volatile elements, likely due to the high-temperature conditions during its formation.
In two sentences
2. Lunar samples have shown significantly lower concentrations of volatile elements such as sodium and potassium, indicating a depletion compared to Earth's crust and mantle.
- This difference may have been caused by the Moon's lack of a protective atmosphere, leading to volatile loss during its formation.