Ice Sheets and Glacial Rebound

A thick accumulation of ice across a continent causes the crust to sink into the mantle. When the ice melts and disappears, the crust rises again. Large areas of land that were pushed down by the weight of glaciers during the last ice age are still rising slowly today. this phenomenon is known as post glacial rebound or glacial isostatic rebound. The eastern part of Canada around Hudson Bay is a good example of a region undergoing rebound. Rebound, a type of crustal uplift, occurs when land rises because the weight that was once on it is removed.

This week, we will be finishing our activities on glaciers by completing a laboratory activity on glacial rebound. The next topic will be Continental Drift and Plate Tectonics. We aim to start this topic on or about Wednesday, March 11th.

Homework # 5: Due Tuesday, March 10, 2009

Textbook: read chapter 15.4, pages 330-333. Do questions 1-4

Homework # 6: Due Monday, March 16, 2009

Textbook: read Chapter 8, pages 172-175. Do questions 1-5.

Reminder: the end of the marking period is Friday the 13th. Prepare for a quiz on Friday.

Comments

Post a Comment

Popular posts from this blog

Rock Cycle

Image
The rock cycle is a model of the natural changes that occur in rocks and rock materials on the earth. The diagram to the right distinguishes between those processes that take primarily at Earth's (external processes) and those that take place within the Earth (internal processes).  Internal processes, such as compression and heating require the conditions of extreme temperature and pressure that occur deep within the Earth. The rock cycle illustrates several important principals of geology. First, nearly all rocks are made from the remains of other rocks (coal and other organic sedimentary rocks are important exceptions).  Second, rocks are classified on the basis of their origin.  Finally, there are a variety of ways that rocks can change in response to changing conditions at the surface or within Earth. Homework  due Wednesday, April 6, 2011 Review Book:  read pages 55-56; do questions 54-60 on pages 56-57, and questions 1-10 on pages 59-60.
Read more

Weather Map Project

Image
In the past two weeks, we have been studying the properties of the atmosphere and the different weather variables. This week we will begin constructing weather maps.  We will also do a weather map project. The details are as follows: Project Due Date :  Friday, February 18, 2011 Task: Your assignment is to construct a weather map, for a seven day period, across the United States. Criteria : You may select the weather for a seven day period of your choosing. The project must be illustrated on poster paper and may include a typed report. The project must include the following items: o Title of Assignment o Two weather maps that track the changes in weather for the seven day period (from either newspaper or internet). o Map must include a general description of the weather patterns, for example, a description of air masses likely to create fronts (cP, continental polar, mT, marine tropical, etc.). o Indicate on map where unstable weather is occurring across the nation (precipitat
Read more

The Transportation of Weathered Materials

Image
Broken fragments of weathered rock are called sediments . These sediments are often carried or transported from their place of origin to another location. Erosion is the transportation of sediments most often done by water, wind and glaciers. The force of gravity drives most forms of erosion. For example, a weathered rock on a cliff is pulled by gravity, causing it to fall to the bottom of the cliff. Continued erosion, aided by wind and water, moves the sediment downslope away from the cliff. This week we will focus on the agents of erosion and in particular, the characteristics of a stream or river that affect its ability to erode sediment. Homework # 3 : Due Wednesday, February 25, 2009 Textbook: read pages 280-284. Review book: read pages 85-88; do questions 24-37.
Read more