39 Which statements explain what happens at deep-ocean trenches? Check two that apply.
A Crust is formed.
B Mountains are formed
Seafloor spreading occurs.
D Crust is subducted back into the mantle and turned into molten rock
E Denser plates slide under lighter plates

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d