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会先答疑。 在此之前，我的口号是： 授人以鱼不如授人以渔。
图解 Illustration 1/ 瀑布与湍流是如何形成的？ 1/How were waterfall and rapids formed? 
Source: http://www./GCSE/AQA/Water%20on%20the%20Land/Waterfalls/LandformsWaterfalls.htm [If you copy the link to open it in a browser, you will find there will be an extra gift, which is a cute animation of how a waterfall is formed.] 
Source: https://session./1/auth/auth?authToken=9d7e4f78da3d1e53b65d2d8d75bff5c7 [Note: see the right, the two stones...] 不喜欢英文资料？ 那么你考A level， 能用中文答题吗？ 算了，不怼你啦～ 为什么不去感谢知乎呢？ 
有回答，但是请自己去看哈哈哈～自己一点一滴看来的才会珍惜。
链接：https://www.zhihu.com/question/20075115?sort=created
2/How a meander is formed? 2/曲流是如何形成的呢？ 
source: minute earth. Use youtube or bilibili to find out. I mentioned it before. 河流为什么会弯曲？ 如果你喜欢卡通的说法： 
Source:
http://homeworkhelp./riversevern/meanderold2.html [yeah, right, the english has geography since childhood, and you guys still want to reply on teachers and two weeks before the exam, try harder.] 
所谓的干货（各种定义）： Hydrosphere - the water component of the earth's environment including oceans, rivers, lakes, glaciers and ice caps.
Drainage basin - the area from which a river collects its water, sometimes referred to as a catchment area
Watershed - the boundary of a drainage basin, usually defined by ridge lines that determine into which catchment water may flow
Tributary - a stream / river that enters a larger stream / river
Source - the point at where a stream / river begins
Mouth - the point at where the river enters the ocean
Confluence - point where two or more tributaries meet to form a bigger stream / river
Evaporation - process whereby water becomes water vapour and rises into the atmosphere
Transpiration - water returned to the atmosphere in a gaseous state through the leaves of plants
Evapo-transpiration - combination of both evaporation and transpiration from vegetation
Condensation - Process whereby water cools and returns from a gaseous state to a liquid or liquid crystal state, usually forming clouds
Precipitation - Water that falls to the ground as rain, hail, sleet or snow
Interception - where precipitation is prevented from reaching the ground owing to the presence of vegetation
Infiltration - water soaking into the ground
Infiltration rate - the speed at which water can soak into the ground
Infiltration capacity - the amount of water that can enter the ground at any given time
Surface run-off / overland flow - water that flows over the ground surface into rivers, streams, lakes and oceans
Through-flow - water that flows through the soil into rivers, streams, lakes and oceans
Percolation - water that flows from the soil into the bedrock beneath
Groundwater flow - water that flows through the bedrock into rivers, streams, lakes and oceans
Channel flow - water flowing within the confines of a river or stream
Discharge - the volume of water in river passing a given point over a period of time. Discharge is measured in cubic metres of water per second (cumecs)
Hydrograph - a graph that show the discharge in a river over a period of time, often used to show the discharge of a river during and after a storm event
River regulation - controlling the flow of rivers to avoid problems such as floods and droughts
Dam - a barrier, usually a wall made of cement, brick etc, built across a river to hold back water
Reservoir - the lake formed behind a dam wall Source: https://pacgeography10./2+-+Rivers 千言万语汇成一句话： 参加英国的地理考试却不动英文思维，是事倍功半。 Do it in an English way for A*.
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