6. Which supercontinents were present on Earth at the beginning of the Cretaceous period?
O A. Rodinia
O B. Laurussia and Gondwana
O C. Laurasia and Gondwana
O D. Pangaea

The earth's internal process which drives seafloor spreading is

What is an additional type of erosion found at the coast? what does it mean?

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