Me what happens after the main sequence stage to stars with medium mass?

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit