The future will be much different than it is today if we do not try to slow down climate change. Reflect on the video and our future on this planet in the space below with at least 7-8 sentences.

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.

Why is the melting of ice a physical change ?

The half-life of a certain element is 100 days. how many half-lives will it be before only one eighth of this elementremains?