- valley/alpine - are bounded by the walls of the valley, flow in the direction of the valley
- ice sheets - larger scale (continental), flow in all directions, cover all but the highest peaks
- ice caps - smaller scale than ice sheets, but cover large upland areas and plateaus
- piedmont - one or more valley glaciers flow in adjacent lowlands
Glacial Movement
(Figure 5.4, p. 127)
alpine vs. ice sheet - one sharpens, one blunts featuresRate of glacial ersosion depends on:
- plucking
- abrasion
- rock flour
- glacial striations
- rate of glacial movement
- thickness of the ice
- shape, abundance, and hardness of the rock fragments
- erodibility of the underlying surface
Landforms Created by Glacial Erosion (Figure 5.7, p. 130)
- glacial trough
Glacial Trough - Franconia Notch pictures
- widens, deepens and straightens
- V-shaped vs. U-shape
- hanging valley
- cirque
- fiords - Somes Sound
- aretes
- horns
Drift - sediments of glacial origin, no matter how, where, or in what form they were deposited
outwash plains & valley
trains - stratified drift at outer edge, contental vs.
valley
kettles (kettle lakes)
eskers - moving, beneath the ice
kames - stagnant, surface of ice
A. Surface feature changes do to Plate Tectonics
- location of land masses
- sizes of land masses
- oceanic circulation
B. Variations in the Earth's orbitProposed by Yugoslavian scientist Milutin Milankovitch
- eccentricity - shape of orbit
- obliquity - tilt of Earth's axis
- precession - wobble of axis
it is the differences in seasonal change, not overall amount of
solar energy reaching the Earth.
Two things to take your mind off the cold weather!
other Chp. 5 readings
skip p. 141 - 145 - Deserts
read p. 145 - 147 - Wind erosion & Wind deposits - RFC , skip all
sand dunes
