After a particularly rainy spring, Kristen and Amanda could no longer bear to stay indoors and with the first sign of fair weather, ventured outside for a walk through the park. As they passed the jungle gym, they noticed that the iron monkey bars looked different. What can you do to pure, solid iron to chemically change it?
cut it
melt it
weld it
oxidize it

Order the following from smallest to largest atom, electron, quark, proton, neutron, molecule, nucleus

Ineed to find the answer of this question because i dont understand it

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.