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tectonic plates are moving apart
* all mid oceanic plates are divergent
*Rift valleys on land are divergent boundaries |
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| Tectonic plates moving towards each other |
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| What is the tallest moutain in the world? |
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Tectonic plates move past each other laterally
*ex. California |
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| Piece of Lithiosphere carried by a moving plate, then accreted(attached) to a continent |
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Disentigration of Rock
-Result of weather process |
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Downslope movement of broken rock material
*includes landslides and related processes |
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| Detachment and removal of broken rock material |
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| Mechanical (physical) weathering |
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| Physical disintegration of rocks |
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| Decomposition of rocks by organisms |
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| Chemical decomposition of rocks |
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Water freezes then expands, fracturing the rock
* important at high latitudes and elevations |
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Peeling off of curved layers of rock-both mechanical and chemical weathering involved
*Trees moving sidewalks up or out or both |
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Definition
Steepest angle that loose fragments can maintain
*natural material has natural angles of repose |
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| Rock is loosed by weathering and falls to the base of the slope |
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Rock fragments at base of slope
*accumulate at the base of moutains |
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| form of mass wasting in which natural material moves downslope as a solid mass (more or less) |
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Definition
| Rotation on a curved failure surface |
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| Slide(translational slides) |
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Rock material slides on a plane of weakness; failure surface parallel to slope
*the Gros Ventre Slide
*Vaiont Italy |
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Definition
| Material flows downward as a fluid |
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Slope collapses. Saturated moves downhill; often slowly; often humid region
*La Conchita Landslide-Santa Barbara |
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| Saturated material moves rapidly down drainage channels; often semiarid/ arid regions; often volcanic mudflows |
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| Saturated soil above permafrost moves slowly downslope |
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| Slow movement of soil particles |
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