Part 2 Landforms and exogenetic processes 2 Landforms and exogenetic processes © Oxford University Press 2006 Quit.
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Part 2 Landforms and exogenetic processes 2 Landforms and exogenetic processes © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes 2.1 When will a river appear? © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes What are exogenetic processes? Besides endogenetic processes, are there any other processes that shape the earth? Exogenetic processes © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes What are exogenetic processes? Let’s Whattake are rivers exogenetic as an processes? example. Exogenetic processes are the processes generated by agents, such as rivers ______ wind and ____. ice _______, They bring down materials from mountains which fill the valleys. © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes What are exogenetic processes? The two main processes are: Denudation Weathering Deposition Mass wasting Erosion Transportation Deposition © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes Before studying the exogenetic processes that the river produces, let’s see how water moves on the earth! © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes In what ways does water move on our earth? Atmosphere Evaporation Where does the Condensation water mainly store Evaporation Evapotranspiration on the earth? Transpiration Precipitation Precipitation Soil/ rocks Vegetation Rivers/ lakes Infiltration © Oxford University Press 2006 Ocean Quit Part 2 Landforms and exogenetic processes In what ways does water move on our earth? Through the water cycle, Let’s look at it in detail. water moves on our earth. © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes In what ways does water move on our earth? Precipitation Transpiration Evaporation Drip flow Stem flow Interception by vegetation Saturated rock Impermeable rock © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes In what ways does water move on our earth? Precipitation Evaporation Overland flow Channel flow © Oxford University Press 2006 Surface run-off Quit Part 2 Landforms and exogenetic processes In what ways does water move on our earth? Evaporation Absorption Surface storage Infiltration Saturated rock Percolation Ground water storage Throughflow Base flow Subsurface run-off Impermeable rock © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes What can we find in a river basin? Watershed River source Tributary Confluence points Main river Mouth of the river © Oxford University Press 2006 River basin is an area drained by a main river with its tributaries and ___________ _____________. distributaries Can you identify Its boundary is different known as the What is a features in a __________. watershed river basin? river basin? Distributaries Quit Part 2 © Oxford University Press 2006 Landforms and exogenetic processes Quit Part 2 1 Landforms and exogenetic processes Denudation Weathering Rocks are weakened or broken down in the moisture changing original place because of _________, ____________ temperature and ________________. living organisms The broken rock pieces are called ____________. rock debris © Oxford University Press 2006 Quit Part 2 1 Landforms and exogenetic processes Denudation Mass wasting Weathered materials The debris is brought down slope by _______. gravity © Oxford University Press 2006 Quit Part 2 1 Landforms and exogenetic processes Denudation Erosion River River Loosened materials are removed. © Oxford University Press 2006 Quit Part 2 Landforms and exogenetic processes 1 Denudation Transportation Please click below to view footage Look at the Theyand arethe sand carried away stones bycarefully. water to other areas! What can you find from the footage? Weathered and eroded materials are carried away to other areas. © Oxford University Press 2006 Quit Part 2 2 Landforms and exogenetic processes Deposition The eroded materials rest on the ground that the river carries or on the _________. river bed © Oxford University Press 2006 Quit