NATS 1880 Lecture 5: Chapter 4

• School: York University
• Department: Natural Science
• Course: NATS 1880
• Professor: Paul Delaney

Document Summary

Relatively recently (aug. 2006) the international astronomical union (iau) decided upon a ddefinition for a planet. This definition excludes pluto as a planet, so now officially there are eight planets in the solar system: orbits the sun. It has sufficient mas to be spherical in shape ( this is due to gravity) It has cleared its planetary orbit of other object. All the factors physical geology, wind, water, etc,. and how they combine in complex ways, make up an environment. As a result of these factors that vary over the surface of the planet, there are many different environments and corresponding ecologies that develop to take advantage of the conditions. The complex interactions of the organisms in these different ecologies. Physical body and lithospher of the planet (the geology of the plnaet) Atmosphere (air) and hydrosphere (water: oceans, lakes and rivers) Earth is the 3rd planet form the sun in our solar system.