When does condensation occur? when a gas turns into a liquid when a liquid turns into a gas when a solid turns into a liquid when a gas turns into a solid

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

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

The volume of the triangular prom is 54 cubic units