What type of instruments have been used to measure the depth of the mantle

Which nims command and coordination structures are offsite locations where staff from multiple agencies come together?

What happens after a star goes supernova? just wondering! [tex]supernova [/tex] answer asap i really wanna know!

Which of the following policies is an example of a command-and-control policy? a. subsidies to education b. maximum levels of pollution that factories may emit c. tradable pollution permits d. none of the above is an example of a command-and-control policy.