Shaping Our Landscape Part 2

Tectonic Forces Build new earth and build the land up through Mountains building (convergent boundaries) Volcanoes Faulting Folding

The Erosion Cycle 1.Weathering Wearing down or breaking up of rock Weathering happens at the surface or close to the surface of the Earth No movement of particles is involved in weathering. Two types: Chemical weathering involves a chemical change in at least some of the minerals within a rock. Mechanical weathering involves physically breaking rocks into fragments without changing the chemical make-up of the minerals within it. 2.Erosion Erosion is the process of wearing away the surface of the Earth in different ways – and the particles actually moving Erosion can happen from wind, water, ice, temperature and even chemicals found in nature 3.Deposition Dropping off of sediments 4.Repeat

Glaciation the process, condition, or result of being covered by glaciers or ice sheets Glaciers have had a profound effect on the topography (lay of the land) in some areas because of their weight and size Act like bulldozers, pushing and moving sediment as they grow and move Many lakes, such as the Great Lakes, and valleys have been carved out by ancient glaciers. When they retreat (because they’re melting), they deposit the sediment that was contained in them Some glaciers can be as much as 3.2 km thick – because it is so heavy the land it sits on is actually compressed and pushed farther down (isostatic rebound)

Glaciation