Which extrusive rock forms so quickly that no crystals form?

a) magma

b) pumice

c) lava

d) obsidian

Can someone list any possible solutions to air pollution ?

According to the united nations refugee agency, more than 2/3 of the world's refugees come from just five countries. which country is not on that list? a) turkey b) myanmar c) afghanistan d) south sudan

Need now! 45 points laboratory: weather map interpretation i need someone to answer the other two questions. i will give to the best answer!