How does the sky change as earth rotates on its axes

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Why are people not able to scuba dive in the deep part of the ocean

Look at the spectrums of a star moving towards earth and a motionless star. which of these is a correct inference that can be draw from the observation of the two spectrums? (2 points) the spectrum of a motionless star is difficult to be viewed separately using oridinary telescopes. the spectrum of a motionless star is identical to the spectrum of a star which moves towards earth. the spectrum of a star shifts towards the red region when the star moves towards earth. the spectrum of a star shifts towards the blue region when the star moves towards earth.