ESS102H1 Lecture Notes - Tephra, Thermosphere, Epicenter
Document Summary
Last day to + classes sep 25. How are humans agents of environmental change: japan huge measures taken before tsunamis and earthquakes. Now however, issues of overpopulation, lack of ability to migrate: alberta oil sands - heavy levels of containments in the athabasca river. Relationships between people and the natural environment include. Natural hazards, resources, world population growth & environmental issues. Catastrophism: shaping of the earth"s andscape by catastrophes. Uniformitarianism the present is the key to the past james hutton, became principle for modern geology. Exceedingly long time the earth is 4. 6 billion years old! An appreciation for the magnitude of geologic time is important because many processes are very gradual. Techniques give us fairly accurate ages of the earth. Chemical segregation early in the formation of earth by gravity. Mantle largest layer between core and crust composed of iron & magnesium. Layers defined by composition are four main ones. Lithosphere rigid outer rind of earth approx.