HEL What laws or regulations are in place to limit the amount of pollution in the yellow river of china? If none, have there been efforts to enact laws? Why or why not?

A60-tooth gear is connected to a 72-tooth gear.if the smaller gear turns 12 times,how many turns does the larger gear make?

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.

Why does the earth spin slowly, not faster? is it possible to prove it scientifically? can you prove it with math?