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The Gaia hypothesis posits that the Earth is a self-regulating complex system involving the biosphere, the atmosphere, the hydrospheres and the pedosphere, tightly coupled as an evolving system. The hypothesis contends that this system as a whole, called Gaia, seeks a physical and chemical environment optimal for contemporary life. [13]
v. t. e. Physical geography (also known as physiography) is one of the three main branches of geography. [1][2][3][4][5] Physical geography is the branch of natural science which deals with the processes and patterns in the natural environment such as the atmosphere, hydrosphere, biosphere, and geosphere.
Earth system science. An ecological analysis of CO. 2 in an ecosystem. As systems biology, systems ecology seeks a holistic view of the interactions and transactions within and between biological and ecological systems. Earth system science (ESS) is the application of systems science to the Earth. [1][2][3][4] In particular, it considers ...
For a complete model of the Earth, mineral physics is needed to interpret seismic velocities in terms of composition. The mineral properties are temperature-dependent, so the geotherm must also be determined. This requires physical theory for thermal conduction and convection and the heat contribution of radioactive elements.
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon 's radius. [32][33] The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some nickel.
Geobiology employs molecular biology, environmental microbiology, organic geochemistry, and the geologic record to investigate the evolutionary interconnectedness of life and Earth. It attempts to understand how the Earth has changed since the origin of life and what it might have been like along the way.
"Man is the product of the earth's surface." (Semple 1911, p. 1) Semple was a key figure in the theory of environmental determinism, along with Ellsworth Huntington and Griffith Taylor. Influenced by the works of Charles Darwin and inspired by her mentor Freidrich Ratzel, Semple theorized that human activity was primarily determined by the ...
Catastrophism. The discoveries of different layers of fossils, such as those containing Palaeotherium and Anoplotherium (pictured), by Georges Cuvier led him to believe that series of catastrophic events wiped out worlds before the modern one. In geology, catastrophism is the theory that the Earth has largely been shaped by sudden, short-lived ...