Why do sound waves move faster through the ground than through the air

Will mark brainliest26. which of these statements are true? (3 points)a. gases are compressibleb. gases fill their containers completelyc. the pressure of a gas is independent of the temperatured. gases have masse. gases exert pressuref. the pressure of a gas is dependent on the volumeg. gas pressure results from the collisions between gas particlesh. gases have a definite volume and shape

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.