Continent Europe and Asia together as a single continent, dubbed "Eurasia". In this model, the world is divided into six continents, with North America and South America considered separate continents. Geologists use the term "continent" in a different manner from geographers. In geology a continent is defined by continental crust: a platform of metamorphic and igneous rock, largely of granitic composition. Some geologists restrict the term 'continent' to portions of the crust built around stable Precambrian "shield", typically 1.5 to 3.8 billion years old, called a craton. The craton itself is an accretionary complex of ancient mobile belts (mountain belts) from
This is My Earth of ecologists and environmental leaders representing every continent, all working to save biodiversity through the conservation of critical habitats around the world. Dr. Gerardo Ceballos Dr. Paul R. Ehrlich Dr. Nick Haddad Dr. David Mutekanga Dr. Simone Oigman-Pszczol Dr. William (Bill) Ripple Dr. Uri Shanas Dr. Jian Wu Ms. Francine Alfandary Mr. David Baldock Dr. Dror Ben-Ami Mr. Henry Gold Dr. Deborah Goldberg Dr. Clive G. Jones Ms. Josephine Kishapoi Dr. Konstantinos C. Makris Ms. Wanjira Mathai Ms. Kirsten Oates Dr. Uri Shanas Ms. Ondine Sherman Dr. Alon Tal This is My Earth This is My Earth (TiME) is a