As far as scientists know, the layer of the sun studied during an eclipse is composed of which atoms or subatomic particles? what is the number one mystery about this layer?

"water seeps into rock cracks and dissolved minerals there.the solution travels through cracks in the. eventually concentrating into large crystals." which process is that

How many countries have portuguese as a national language?

Which characteristics are true of the arabian desert? multiple answers choose all answers that are correct. a. is mostly below sea level b. covers almost the entire arabian peninsula c. contains the largest sand sea in the world d. has very few people living there