Question

along with subduction, what other process changes sedimentary rocks to metamorphic rocks? gravity temperature weathering oxygenation

Explanation:

Metamorphic rocks form from sedimentary (or igneous) rocks due to heat (temperature - related, often from magma or burial in Earth's crust) and pressure (like from subduction). Gravity alone doesn't metamorphose rocks. Weathering breaks rocks down. Oxygenation is chemical - interaction with oxygen, not a metamorphic process.

Answer:

temperature