Glaciers - Geosc 10 Thursday March 25th 1999 Announcements Exam is Thursday April 1st Lecture notes I Preview A Glaciers-mass of snow or ice that

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Geosc 10 Thursday March 25th, 1999 Announcements: Exam is Thursday April 1st. Lecture notes: I. Preview A. Glaciers --mass of snow or ice that deforms and moves; glacial ice can be extremely thick or not thick at all 1. Erosion of glaciers --occurs in two ways a. Freezing and thawing b. The flow of ice itself 2. Transport of glaciers --occurs either in or on the glacier 3. Deposition of glaciers B. Plastic flow/creep --the way a glacier moves C. Temperature greater than or equal to 0.8 T melt (temperature glacier melts) II. Erosion and transport A. When we talk about glacial erosion or transport we mean mechanical weathering only 1. Freeze-thaw--seep into cracks, freeze then expand 2. Cold B. Not chemical weathering which is a mineralogical change from primary to clay 1. Involves the release of cations (K, Na, Ca, Mg) 2. Si to rivers then to the sea II. Plastic flow/creep (Temperature greater than or equal to 0.8 T melt (80% melting temperature) A. The glaciers are close to their melting temperatures therefore we think that
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/21/2008 for the course GEOSC 10 taught by Professor Furman during the Spring '99 term at Pennsylvania State University, University Park.

Page1 / 3

Glaciers - Geosc 10 Thursday March 25th 1999 Announcements Exam is Thursday April 1st Lecture notes I Preview A Glaciers-mass of snow or ice that

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online