sorting of earth materials
DESCRIPTION
Sorting of Earth Materials. First, Some Questions:. 1. If we have grains of sand of the same size but with different densities, how will they sort? (e.g. cat litter and gravel) 2. If we have particles of different sizes but the same density, how will they sort? . Answer 1. - PowerPoint PPT PresentationTRANSCRIPT
Sorting of Earth Materials
First, Some Questions:
1. If we have grains of sand of the same size but with different densities, how will they sort? (e.g. cat litter and gravel)
2. If we have particles of different sizes but the same density, how will they sort?
Answer 1When particles are the same size and the
different density (think of the density blocks we used) they will layer or sort according to density:
• Most dense on bottom, least dense on top.
Answer 2:
When particles are different sizes but the same density they will sort by size:
• Large particles on top, small on the bottom
Nature is more complicated. Let’s look at some real life examples:
* Beaches
* Rivers and Streams* Canyons, road cuts
How do the particles on a beach sort?
The bigger particles are farther up on the beach while the smaller grains of sand are closer to the water. Why do you think this happens?
Rivers and Streambeds
http://gregrob.ca/640x480/stream_bed.shtml
Remembering water is a factor we have to consider, how would particles sort in a stream?
http://www.uwsp.edu/geo/faculty/ritter/geog101/textbook/fluvial_systems/geologic_work_of_streams.html
Canyons & Road cuts
Sorting of dry material
We can see examples of the sorting of Earth’s materials by looking at the Grand Canyon.
The earth’s surface is constantly changing. This occurs slowly. Grand Canyon !
http://geoscape.nrcan.gc.ca/nanaimo/images/photo_rock_layers_e.jpg
East Side of Flaming George