GEOG 2RC3 Lecture Notes - Lecture 1: Axial Tilt, Sea Ice, Canadian Shield
20 Jan 2018
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Orbital eccentricity: the earth orbits in an ellipse shape which influences our solstices and equinoxes: 2. Axial precision: the slow and continuous change in the orientation of the earths rotational axis. Wobbles slowly and is pulled by gravity from the sun and moon to the equator: 3. Axial tilt: the angle of tilt between the earths rotational axis and orbital axis. Determines season length, and average temp is determined through the axial tilt. > *these three things contribute to solar insulation and ultimately ice ages. Glaciers get bigger and take up more water, scour landscape: 4. Sea levels drop, atmosphere becomes drier: 5. Glaciers advance and retreat leaving deep lines in the bedrock (canadian shield) and created millions of lakes in canada. > as glaciers retreat across the landscape, they scored off many layers of rock: 7. Sea levels rise and atmosphere becomes warmer and wetter.
