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Y7 Geography R&F

Revision of Rivers and Flooding

QuestionAnswer
Condensation The water vapour condenses into tiny water droplets which then turn into clouds
Precipitation Big water droplets fall as either rain, hail or snow
Evaporation Water evaporates into water vapour
Interception Leaves catch some rain as it falls
Transpiration Plants and trees also breathe out water vapour through holes in thier leaves
Surface Runoff If the ground is hard or very wet rainwater just runs along it
Infilteration Rain soaks through ground
Through Flow Below the ground some water flows sideways through the soil
Groundwater When water soaks right down and fills up the pores and cracks in the rock
Groundwater Flow Groundwater flows along slowly
Permeable Rock Lets water seep through
Impermeable rock Does'nt let rain seep through
Percolation Water going down underground just beneath infiltration
Source Starting point of the river
Drainage basin The area in which rain water drains into the river
Watershed Imaginery boundry that seperates one drainage basin from the next.Usually on high ground
Confluence When rivers meet
Flood Plain Land that gets flooded when river overflows
Mouth of River Where the water flows into the sea, ocean or lake
River Bank Side of River
River bed Floor of river
Channel Where the river flows
Tributaries Smaller rivers that join the big river
As you go down a river it gets: Wider,Flatter,Smoother
Erosion Pick up a material from a place
Transportation Moving the eroded material down the river
Depoistion When the river reaches flatter land it slows down and is no longer able to carry all the material so it deposits larger materials first getting smaller as you go along
What are the 3 jobs of a river? Erosion,Deposistion,Transportation
Abrasion Sand and stones scrape the bed and banks eroding them away.
Attrition Rocks and stones knock together and wear each other away.
Hydrauaulic action Water is forced into the cracks in the bank and eventually break
Solution Is dissolved material in the river it can be carried along but you cant see it
Suspension Small particles of rock and soil are carried along in the water.They make it look muddy
Bedload Heavier material carried along th bottom of th river
Saltation Sand grains and small stones bounce along the bottom
Traction Large rocks and stones roll along the bed
Sediment The deposited material
V-Shaped Valley The river cuts down like a saw this is called downward erosion.Raining in the V-Shaped valley will make it wider
Waterfall 1)Hard rock and soft rock 2)River flows over the hard rock it erodes the soft rock which forms a plunge pool3)Then it erodes away under the hard rock forming an undercut4)The ledge collapses under own weight into the plunge pool then back to beginning
Meanders Water on the outer curve is fast and water on the inside is slow.Erosion takes place on the fast.Deposistion takes place on the slow.Over time the erosion increase and so dors the deposistion.A meander is formed.
Oxbow lakes During a flood the river cuts across the meander.After time deposistion builds up along the edge and the oxbow lake is closed off the water stays the same.
Gorges The gorge is a force of downward erosion that leads past the waterfall
What 6 factors increase the risk of flooding?Why? 1)Impermeable rock2)Hard dry soil3)Wet saturated soil4)Steep slopes5)Cutting down trees6)Building in the drainage basin
Name 6 man made buildings or things can get ruined during floods? 1)Homes2)Office3)Schools4)Shops5)Malls6)Roads
How can floods give you diseases such as typhoid? Sewage system water gets mixed with drinking water can make you very ill.
Name 4 things that could be swept off in a flood 1)Farm animals2)Crops3)Cars4)Furniture
How many cm of water on average does it take to sweep you off your feet 15cm
Meanders Water on the outer curve is fast and water on the inside is slow.Erosion takes place on the fast.Deposistion takes place on the slow.Over time the erosion increase and so dors the deposistion.A meander is formed.
Oxbow lakes During a flood the river cuts across the meander.After time deposistion builds up along the edge and the oxbow lake is closed off the water stays the same.
Gorges The gorge is a force of downward erosion that leads past the waterfall
What 6 factors increase the risk of flooding?Why? 1)Impermeable rock2)Hard dry soil3)Wet saturated soil4)Steep slopes5)Cutting down trees6)Building in the drainage basin
Name 6 man made buildings or things can get ruined during floods? 1)Homes2)Office3)Schools4)Shops5)Malls6)Roads
How can floods give you diseases such as typhoid? Sewage system water gets mixed with drinking water can make you very ill.
Name 4 things that could be swept off in a flood 1)Farm animals2)Crops3)Cars4)Furniture
How many cm of water on average does it take to sweep you off your feet 15cm
Created by: bookcase