The following profile describes concentrations of several chemical species with depth in a lake sediment.

a. describe how the redox ‘front’ (aerobic/anaerobic interface) moves in time, as the weather (wet vs. dry) and seasons (cold vs. warm) change.

b. explain what microbial processes would produce these profiles. provide specific reactions

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.