日一月一年七七九一层公年六十六國民章中
11. Carefully study the given
contour map showing the
relief of. Tai Lam Chung.
in New Territories and answer the followings:
a. What process had happened to the rivers in this are area?
b. With reference to the contour map, describe and illustrate how this process had taken place,
育教傑輩頁一第張六第日二十月一十年及丙歷要
WAH KIU YAT PO
郭日僑惠
六期星
9
1977中學會考試題預習專欄
明德社主編
"Hain Characteristic Features
of
地理(八)·黎仲豪、李婉儀
Answeraz
8.
GEOGRAPHY (8)
The feature shown in the photograph is a pothole. Potholes are holes found in the bed of a river. They are always circular or elliptical in outline, and a few conti- metres to metres in depth. They are most often observed in the stream channel during the low water or along the bedrock walls, where they
have been left stranded after the stream has cut its channel
downward. Potholes are most
·common.in narrow valleys,. but they often occur in broad valleys as well.
A pothole begins as a shallow depression in the bed- rock channel of a stream. This initial depression may be caused by ordinary abrasion, by irregularity in the bedrock or by hydraulic action. The water swirls in auch depres- sions, with the sand, pebbles and even cobbles déposited there . By the continued swirling of the running water, these loads act.as grinding tools deepening and enlarging the depressions into potholes.
adelta:
A delta is a lowlying swampy plain built up at the mauth of a river by its
deposition, It is crossed by: aumerical levee-flanked distri- butaries. Remnante:of the
lagoons and marshes formed in ite early stage, can be found. The seaward edge of it is fringed by spite and bars. The ahape and size of a delta vary according to the amount and type of loada deposited and the mode of accumulation. The common shapes of deltan are arcuate, bird's foot and estuarine,
Formation:
When a stream flows into
a body of atanding water, such 我想 la, lake` or an ocean, i ta
velocity and transporting
If
it carries enough load and if
power are quickly a temmed
the estuary, it enters is
whallow and free from tidni
current or strong ocean current,
a delta will gradually be built.
The stages in the formation and development of a delta can be summarised as follow: Stage In
At the estuary abundant loads are dropped, These loads will be coagulated when they are in contact ̇with.mea water. The river is thus choked and there- fore branches out into se- veral distributaries. Spits and bars arise. and lagoons are formed.
-The
lovees of the river extend seaward via the dis tribu- tarios.
Stage II:
When more sediments are deposited, the lagoon will be gradually filled, and they become swampy. The delta begins to assur more solid appearence. Stage III:
SIBSE & "The delřa
Ribs in Jan
begini de fuumwa Shape
Jand
Jand
A
STAGE A mature ketta
land
The old part of the delta is slowly raised by furth- er deposition with the aid of the colonization of vegetation. Swampe gra- dually disappear and this part of the delta becomes dry land .
SKETCH DIAGRAME SHOWING.
THE FORMATION OF A DELTA
STAGE I· Lagoons are enclosed.
Beginning of a lagoon
Jea
land
~lever· Hanked.
distributaries
Main river
STAGE I The delta
begins to assume a
Shape
Sediments
Consolidated
Revision Vuestions for next wook:
10. Name and discribe the
processes leading to the formation of the feature shown in the photograph.
華僑晚報 分類廣告 每天弍元 上期繳費
SMALL
ZOWN
TEXAS
特烈達史積善
50
SCALE 1:50000
。。。。
上徧法槍在此愛寃一夜加献盛 ॰梁徧律枝為仇人獄點場開
環十
廣夯天今聲麗·都京
山被在在人不被未芈十午映大場
【逼遠近!報奪雪
偏偏被逼 出面飛!
電單車與火車
上梁山!
請早定座 環大碰撞!
連車
鋒立影業有限公司
PRIO
!片巨作動部全激刺張類生
| 獣加快 點
冷百
土場夜午晚今門金 硬面酷折 碰對 硬面
鬥搏大苑生
翻擊飛 相門鐵三 堅保翠蘇保非 山越車 搏性萎斯賀 芝珊"頓
「番發「命惠
業難殺兩
分解得人漠
情屈
彩七 闊
幕銀
映獻天今倫
老野紫保即少妙一專遞鬼穴面上事
週好好 功活動和賞豐速愁潭與漢
作笑佳來十 都 敦
宜美前戲(实了和个见了换节镜片動惹最年
爽咁都時過·片笑睇年新
[聲華·華大·華豪 片巨實現會社
女快
不會兒。作動張期激 分司公洲款
裝
味 唔
鳥類股計
笛
姆虱鱼鳔
SOMETIMES
PROVIDENCE
韓蘭米士馬譚維
末週
高雄開賽性女必每豪巨 毀佔罪車愛模有逢華富 別鸛題惹剌特新週別牙 駕 墅巢人禍激兒歡末聖醫 DEATH WEEKEND
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