What is the name of the uppermost layer of the atmosphere? why does it feel cold there, even though the temperature can be very high?

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.

Amixture with the same composition throughout is!