A Question of Rivers
اسلاید 1: ‘A Question of’ …Nine Number Picture BoardsThis nine number picture board is adapted from a template available from www.sln.org.uk/geographyClick a number to link to an imageClick the image to link to an information pageClick the yellow square to link back to the imageClick the red square to link back to the picture board Once selected, numbers will change colour
اسلاید 2: A Question of Rivers132456789
اسلاید 3: 1How were the little circular depressions in the bedrock of this river formed?
اسلاید 4: 2This is Scotland’s longest river. Which river is it? Into which body of water does it flow? Scotland’s fourth largest city is located on its estuary? Which city is it?
اسلاید 5: 3Image produced from the OS Get-a-Map service. Image reproduced with kind permission of the OS and OS of Northern IrelandDescribe the physical features of the river and its valley
اسلاید 6: 4What river feature occupies the centre of this photo? How does the river change downstream of the feature?
اسلاید 7: 5What features identify this stretch of river as part of its upper course?
اسلاید 8: 6Why has a waterfall developed here?
اسلاید 9: 7How would you know that this valley was not carved by the river which flows in it today?
اسلاید 10: 8Image produced from the OS Get-a-Map service. Image reproduced with kind permission of the OS and OS of Northern IrelandDescribe the physical features of the river and its valley
اسلاید 11: 9Describe and explain the differences between the sides of the river
اسلاید 12: The circular depressions are little pot holes.Small stones are swirled around in them when the river is flowing higher and faster than it is at present.The pot holes are eroded by the abrasive action of the swirling stones.
اسلاید 13: The photo shows the River Tay which at 117 miles is Scotland’s longest river.It rises only 25 miles from the west coast but flows east to its mouth on the North Sea.Although many English rivers e.g. the Severn and theThames are longer than the Tay, the Tay carries a greater volume of water than any other British river.Dundee is located on its estuary.
اسلاید 14: ox bow lakelimit of tidal influenceriver channel more than 8mmeandersbroad, flat flood plaingentle long profileembankments/levees
اسلاید 15: This feature is a confluence. It occurs where a tributary joins the main stream or river.Downstream of a confluence , the river increases in width. The discharge of a river (the volume of water it is carrying) also increases significantly.
اسلاید 16: interlocking spurssteep valley sidesabsence of flood plainsteep long profilelarge bedload
اسلاید 17: a band of hard rock interrupts the river’s courseAn overhang develops where the softer rock below is eroded. In time this will collapse.relatively softer rockplunge pool
اسلاید 18: This valley is a U-shaped valley in the Scottish Highlands. It was eroded by ice during the Ice Age.It is much too large and deep to have been carved by the small river which now flows in it.The river is called a ‘misfit’ as it is not in keeping with the scale of its valley.Although the river is in a highland valley, it displays features of a valley in its lower course (meanders). This is because the valley floor is so flat.
اسلاید 19: steep valley sidesmany small tributariesno flood plainriver channel less than 8m widesteep long profileriver follows a relatively straight course
اسلاید 20: 9On the inside of the meander water is flowing more slowly. This results in deposition and the formation of the slip-off slope or river beach.On the outside of the meander water is flower more quickly. This results in erosion and the formation of a cut bank or river cliff.
اسلاید 21: This powerpoint was kindly donated towww.worldofteaching.comhttp://www.worldofteaching.comIs home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching
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