Describe the cycles of four chemicals essential to life on earth: water, carbon, nitrogen and phosphorus.COMPETENCIES TO MASTERCan identify and explain key concepts in environmental science, such as water, carbon, nitrogen and phosphorus cycling and biodiversityCan identify and explain the basic principles of population ecology, such as population growth and distributionCan identify major environmental problemsCan analyze and critique leading solutions to major environmental problemsCan identify and analyze ethical issues presented by scientific and technologic developmentsCan solve practical problems using measurements such as time, temperature, distance, length and volum