weathering and erosion
DESCRIPTION
Weathering and Erosion. Weathering – processes by which environmental agents at or near the earth’s surface. cause rocks and minerals to break down. Sediment-. Small pieces of rock. Mud, sand, or silt are very fine pieces of rock. Weathering Processes. Mechanical weathering –. - PowerPoint PPT PresentationTRANSCRIPT
Weathering and
Erosion
• Weathering – processes by which environmental agents at or near the earth’s surfacecause rocks and minerals to break down
Small pieces of rock. Mud, sand, or silt are very fine pieces of rock.
Sediment-
Weathering Processes
Chemical weathering – changes the chemical composition
of minerals and rocks
Mechanical weathering –breaks a mineral or rock into smaller pieces (physical changes)
Mechanicalweathering-
Wind weathering
in Monument Valley, Arizona
Chemical Weathering- Rusting can completely eat away iron.
Erosion – process by which gravity, moving water, wind, or ice transports pieces of rock and deposits them elsewhere
Devil’s Tower- volcanic plug
Water Erosion
Deer Creek Falls
Thunder River in the
Grand Canyon
Wavecut pattern, a geological feature caused by the sea's erosion of cliffs, seen at Southerndown near Bridgend, South Wales.
Loess is a deposit of silt or material which is usually yellowish or brown in color and consisting of clay or dust brought by wind
In the Swiss Alps-The Upper
Grindelwald Glacier and the
Schreckhorn
Glaciation- changing of landforms by slowly moving glaciers
Glacial Erosion
A glaciated valley in the Mount Hood Wilderness showing the characteristic U-shape and flat bottom.
• Moraine is rock debris, fallen or plucked from a mountain and transported by glaciers or ice sheets. The moraine may be lying on the glacier's surface or have been deposited as piles or sheets of debris, where the glacier has melted
Soil Factors• Parent material – chemical composition
of the original rock from which soil develops • Relief-physical features of a landscape • Organisms- plants, worms, ants that decompose material • Climate – amount of precipitation and prevailing temperature • Time – longer period develops thicker more well-developed soil(2.5 cc per 100 years)
Building Soil• Weathering and erosion are a part
of the process of building soil• Soil is a loose mix of:
–Weathered rock–Organic matter–Air –Water
Soil FertilitySoil Fertility depends on the texture of the soil and the amount of: • humus- the amount of organic
material• air and water
Works cited
• scidiv.bcc.ctc.edu/barmin/geo101/6.html • Wikipedia, the free encyclopedia • http://www.edu.pe.ca/southernkings/
loesssp.htm