What is the source of most of the salt in the oceans? Human activities adds salt into the ocean, rivers and streams carry sediment containing salt to the ocean, marine fish produce salt adding it into the ocean, or wind blows salt into 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.