PowerPoint Lectures for GE141(A) with Prof. Nelson:
Artesian flow is water rising above the local water table due to hydrostatic head. This artesian well in Rangeley, Maine, remains flowing despite the fact that Poland Spring is pumping water nearby at a rate of 5000 gallons per minute, filling four large tanker trucks every hour.
Adequate supplies of fresh water are becoming one of THE global environmental issues of the 21st century; 25% of the human population of the world is already suffering from inadequate water resources. Maine is one of the few areas in the world with an abundance of high-quality fresh water, though last year (2016) was very dry and produced a modest drought, particularly in the southern part of the state.
Earth and Environment
Spring, 2017

These presentations (in Microsoft PowerPoint8) are made available solely for the use of students in GE141: Earth & Environment, at Colby College. These are the actual presentations made in class, sometimes augmented slightly to enhance the materials. However, nothing of substance will be added to materials once they have been presented in class without notifying the entire class that such a change has been made.
In order to view these, you will need to download them onto a computer capable of running Microsoft PowerPoint. Colby users not having this software may download it from the general server.

Click HERE for access to OLD EXAMS for this section of the course.

The Maldives in the Indian Ocean are a popular tourist destination. However, rising sea level produced by global warming is posing a threat to the existence of the island nation, all of which lies less than 10 feet (3 meters) above modern sea level.

(image from http://www.hotel-online.com/News/PR2009_4th/Dec09_HIMaldives.html)


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[ This page last modified on 24 April, 2017. ]