How do electromagntic waves travel?

Why are scientists concerned about the depletion of the ozone levels in the stratosphere?

Which animal is a producer in this ecosystem

What is the main reason that attitudes are more often revealed in spoken rather than written language? a. in writing, we try to put the "best face" on what we write. b. we speak far more often than we write. c. in writing, we can more easily conceal our attitudes. d. in spoken language, we are often careless in our use of words.