About 30 miles into the earth, the speed of seismic (earthquake) waves increase. What does this change in speed indicate about the material through which the seismic waves are traveling?

An example of what is geese flying south for the

Which of the following is true of microbes? a. ninety-nine percent of all microbes are pathogenic.b. gene expression in bacteria is very similar to gene expression in humans, which facilitates the use of bacteria in recombinant biotechnology and gene therapy.c. all bacterial enzymes are harmful to humans and the environment.d. microbes create pollutants and toxins that harm the environment.

How is the carbon cycle related to global warming ?