Lesson ObjectivesThis lesson we will be looking at types of mass movement and weathering.By the end of this lesson you will be able to:• Name 3 types of weathering and two types of mass movement• Describe how weathering causes mass movement• Explain slumping
Weathering and ErosionWeathering – the breaking down of rock without any involvement of moving forcesErosion – the breaking down of rock by a moving force such as a wave
Saturation by rainfall (ground cannot hold anymore waterClay Rotational Slumping Erosion by waves
Mass Movement • Bottom of the cliff eroded by waves and undercut • Rainfall saturates cliff and makes it heavier • Water trapped between layers of rock in the cliff acts like a lubricant • Rocks slide down cliff in a rotational manner • Often happens in clay • Rocks are weathered on the cliff face • They break loose and fall under the influence of gravity
Coastal WeatheringSalt Crystal Growth Acid Rain BiologicalSea water contains salt. All rain is slightly acidic. The roots of vegetation grow into cracks in the When water lands on Polluted air can be very rock. rocks, the water acidicevaporates leaving salt. This splits the rock apart. When rain falls on rocks,As this process repeats the acid reacts with somethe crystals grow putting of the minerals causing pressure on the rocks them to dissolvecausing it to break down into smaller fragments
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