Simplify the following text for a Grade 12 native English-speaking person.
Original: Others argue that the subcontinental lithospheric mantle was too buoyant to subduct , and that the rarity of Archean rocks is a function of erosion by subsequent tectonic events .
Simplified: Others argue that the oceanic lithosphere was too buoyant to subduct , and that the rarity of Archean rocks is a function of erosion by subsequent tectonic events .