How does heat, without causing melting, damage a rock below eath’s surface

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

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.

Which of the following units is not an official si unit? mole liter kilogram ampere