Samples from the seafloor around the Mid-Atlantic Ridge and the East Pacific Rise show that both areas have been creating new oceanic lithosphere in the last five million years. Samples from the
East Pacific Rise show the five-million-year-old seafloor is three times as wide as similarly aged
material from the Mid-Atlantic Ridge. What does this say about the rate of seafloor spreading in
the East Pacific?

What tests were able to determine when continental crust was formed?

What is one reason why areas that are just beginning to industrialize typically have a higher rate of population growth than countries that are already industrialized? a. most industrialized countries have laws regulating how many children women can have. b. the average lifespan in developing countries is much higher than in industrialized countries. c. developing countries need labor to fill their rapidly expanding industries. d. developing countries are just beginning to experience improved food production and health services.

Can you think of any problems that could come from using only 15 years of data to predict trends for the next 100 years? explain your answer. how could you prevent some of these problems?