What does the lack of S waves from earthquakes tell scientists about what is inside earth?

A. There must be a solid
B. There must be a gas
C. There must be a liquid
HELP ME PLZ ILL MARK U BRAINLIEST

Joe shines white light into a bowl half full of water at an angle of incident of 27.5°. calculate the angle of refraction in the water given the indices of refraction for air and water are 1.00 and 1.36, respectively.

Which words or phrases identify layers of groundwater? check all that apply. water table kettle lake saturation zone underground lake sinkhole will give brainiest, answer quickly.

Areaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: