ERTH 2415 Lecture Notes - Lecture 1: Thorium, Magnesium, Middle Term
19 Jun 2015
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Document Summary
They become natural disasters when they intersect with vulnerable communities or they are ignored by people. Frequency = 4 occurrences per year: return period length of time between similar events. Period = 1/frequency: magnitude amount of energy fueled a natural event. 4 energy processes fuel the earth"s natural processes: earth"s internal energy, gravity, solar energy and impact energy: natural hazard of these 4 sources of energy: Earth"s internal energy tsunami, earth quake and volcanic eruption. Solar energy meteorological storm, floods, drought, wild fire, magnetic storm. Impact energy impact with space objects: using origin of the solar system to introduce 4 sources of energy. Planetary accretion gravity, solar energy, impact energy. Planetary differentiation gravity, earth"s internal energy: gravity: force of attraction between two masses m1 and m2 separated with a distance r. F =g*m1*m2/r*2: solar nebula: rotating disk containing cosmic gas and dust from which sun and planets are born.
