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Lecture 2

Environmental Hazards Week 2 Notes.docx

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University of Toronto Scarborough
Environmental Science
Mandy Meriano

Natural Hazards Week 2 Notes Movement of tectonic plates create most of the major geological features of earth, including earthquakes, volcanoes, mountain chains, mineral deposits, plays a major role in driving climate, ocean and atmospheric circulation and evolution. The core and mantle are the source of much of the earths heat. Heat is released by radiation and convection. Convection of the mantle and the asthenosphere drives the tectonic cycle. The collision of lithospheric plates causes most of the major features and activity on the surface of the earth. The lithosphere is not one continuous later. It is broken up into plates that move relative to each other a few cms a year. Lithospheric plates can be created and destroyed. Lithospheric plates move horizontally. Movement of the lithospheric plates are accommodated by subduction (destruction) where plates converge and the creation of new lithospheric material where plates diverge. The earth’s heat is generated by radiation and convection. Convection is ultimately responsible for the earths tectonic cycle. Atlantic ocean growing bigger by 5cm a year. There are three types of convergent margins – When an oceanic plate collides with the continental crust (creating a costal range of volcanoes and mountains), when two oceanic plates collid
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