What forms on the ocean floor in a subduction zone?

a- hot spot

b- trench

c- lithosphere

d- mantle plume

Which of the following is not considered one of the four major oceans (1 point)

The earth is composed of three different chemical layers: core, mantle and crust. the formation of these layers was from a process called

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted