Which layer is the oldest? How do you know? Which layer is the youngest? How do you know?
Has any of the rock layers undergone metamorphism? How do you know?

Plants in the tundra biomes have had to adapt to live long periods of time without a. cool temperatures b. sunlight c. oxygen d. water

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

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