Which phrase describes how metamorphic rocks form? form from melting
form at Earth’s surface
form from sediments
form from existing rocks

Light waves travel than sound waves.

Substance a is a nonpolar liquid and has only dispersion forces among its constituent particles. substance b is also a nonpolar liquid and has about the same magnitude of dispersion forces among its constituent particles. when substance a and b are combined, they spontaneously mix.

Who examines and coordinates the cleanup of polluted sites?