It will address a variety of regional elements, such as climate, soil, vegetation, hydrology, geomorphology, and geology. A variety of sites located on the Canadian Shield, the zone of thick glacial deposits to the south, and the transition between them will be the focus of the report. It is supplemented with previous research on the region. September 8, 1999, day one of the field study involved an area of largely granite bedrock that is part of the Canadian Shield and is the most northern point of study (see Map 2). September 9, 1999, day two, involved three main areas of study: the Bridgenorth esker (Map 3), Mark S. Burnham Park (Map 4), and the Rice Lake drumlin (Map 6).
Glacial Till The characteristics of glacial till reflect the erosional, transportational and depositional history of the constituent sediment.’ Glacial till is a heterogeneous mixture of rock fragments ranging in size from clay to boulders and is deposited directly from glacial ice without water transport. (Strahler A. H. & Strahler A. N. 1976). Ice sheets deposited in the Pleistocene period may be more than 30 m deep and inevitably the constituents of glacial till will reflect the retreats, advances and stationary phases of the ice which have taken place during the history of a glacier since its formation. I shall outline the various forms of glacial till, giving consideration to the type of prevailing climatic conditions which give rise to their formation and deposition to illustrate how the constituent sediment does provide evidence for glacial activity over time. As glaciers are so effective at erosion and transport, large quantities of debris is also associated with them.
Fluvioglacial Landforms landforms deposited by meltwater from glaciers. some found within the glacier and some under the glacier. outwash plains- composed of sand, gravel and clay (from snout). deposited during times of inc. ablation (glacial retreat). material is sorted by meltwater at the snout.
To understand the whole idea of lake effect snow, one must travel to the past where this phenomenon was first discovered and from there; move forward in time to see the progress that has been made not only in understanding this, but also forecasting it as well. HISTORY Lake effect snow was not a quick discovery compared to other forms of weather. In the 1800’s when there was no satellites or weather radar to track a storm, early day forecasters would have to get observations from spotters across the country and provide a one and two day forecast on the type of weather that may ... ... middle of paper ... ... Kristovich. "Observations of the Cross-Lake Cloud and Snow Evolution in a Lake-Effect Snow Event." Monthly Weather Review 139.8 (2011): 2386-398.
Traveling north on an Indian trail, the first sign of the area’s cataclysmic past would have appeared out of place from the rolling hills typical of the Western Pennsylvanian landscape. Peering down into a valley over 400 feet deep, the mighty gorge was littered with enormous boulders, thus framing the Slippery Rock Creek. These relict boulders of rock types foreign to the area are known as “glacial erratics” and are indicative of the strength of the encroaching glacier. As defined by the National Snow and Ice Data Center, “Glacial erratics are stones and rocks that were transported by a glacier, and then left behind after the glacier melted. Erratics can be carried for hundreds of kilometers, and can range in size from pebbles to large boulders.
Glacial deposition is caused by melting when material is dumped in situ. It leads to unsorted material as when it melts everything is just deposited in no particular order. The material is also unstratified and unconsolidated. It is a mix of all sizes and shapes of rocks. The a-axis of the rocks tends to be found parallel to the direction of the ice flow.
As snow at the surface gets buried with time it gets compressed to form solid ice and this ice carries with it information about the climate when the snow originally fell. By drilling down into a glacier and recovering this old ice, the information can be used to help understand past climate. The information obtained from ice cores can be divided into three types. The first of these types of information comes from the solid and dissolved impurities in the snow. Usually snow that falls in those places is almost pure water, but it still contains traces of dust, and pollutants from human activities.
Roughly 9 polymorphs of ice are defined, only one, however, occurs naturally on Earth. This common form of ice is known as ice 1h, and its lattice displays six-fold rotational symmetry. The incorporation of sea salt or other ions in the crystal lattice of ice faces both size and charge restrictions, thus the salt and water do not form solid solution. This means that as the ice grows, the ions are rejected and most of them are returned to the water. Some, however, are retained within the ice matrix as liquid inclusions; creating a network of channels through with this brine travels.
Following frequent changes in climate in the Quaternary period, glaciers have advanced and retreated leaving a layer of glacial deposits in their wake (Natural England). These deposits were transported downstream via meltwater rivers to lowland areas, making them fertile and very useful for pastoral farming. As such, lowland areas have become popula... ... middle of paper ... ...ved January 16, 2011, from Crimestop Guards: http://www.crimestopguards.co.uk/manchester.htm Geology Roam. (n.d.). Retrieved January 16, 2011, from Edina Digimap: http://digimap.edina.ac.uk/geologymapper/geologymapper;jsessionid=2E1FABFC46F36A0FF08FE920D9377244?execution=e1s1 Greater Manchester.
There is an abundance of glacial debris and exposed rock. The Canadian Shield has a harsh environment and a varying terrain. The St. Lawrence Lowlands, or Valley, lies along the St. Lawrence River and is up to sixty miles wide. The land is mostly flat. The Appalachians are a continuation of the Appalachian Mountains in the United States.