Question

this table compares different types of rock. based on the table, how is siltstone formed? by the cooling and hardening of melted rock by the pressing of layers of sediment together

Explanation:

Looking at the table, siltstone is listed under sedimentary rocks. The formation process for sedimentary rocks is "layers of sediment are pressed together, or compacted, to make rock".

Answer:

by the pressing of layers of sediment together