GEOG 203 1nd Edition Lecture 15 Outline of Last Lecture I Intro to tectonics mountains and terrain evolution II Shifting continents a Continental drift seafloor spreading and plate tectonics b Plate interactions III Mountains and other landforms IV Denudation Outline of Current Lecture I Review for quiz II Terrain evolution III Preparation for exam 2 Current Lecture These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Review for quiz No tilt no seasonality Max tilt 90 max seasonality North pole most radiation Northern hemisphere insolation 22 24 degree tilt variation 0 degree tilt glaciers o axial tilt o eccentricity of Orbit o precession of equinoxes directional tilt results in seasons determines where seasons occur wobble aphelion far away from sun happens at northern hemisphere summer Minimal tilt 22 degrees Northern hemisphere place for glaciers to build up continentality High latitude Southern hemisphere only Antarctica can build glaciers not large land masses at high latitudes Climate cools gases decline cool temperature down positive feedback higher albedo less greenhouse gases Major greenhouse gas most important is water vapor Cooling less water vapor Pleistocene cool period Human held off ice sheet agriculture methane production clearing of land Little Ice Age 1550 1850 cooler climate o Glaciers in Alps expanded volcanic eruptions plagues less people vegetation regrowth causing climate to cool Holocene warmer Anthropocene part of Holocene in which people played a role Atmospheric concentration of methane less declined when climate cools Less CO2 less greenhouse effect temperature cools Terrain evolution Terrain Evolution as a concept o Geomorphology is the study of landforms Test Preparation for Exam 2 Make sure you re reading textbook and going through questions Dr Lafon has chosen for us to work out Do preparation for class exercises before classes Exposing yourself to material several times Do things as simple as looking over notes after that day s class