育数保:
頁三第四第
日四初月二年申戊聲夏
D108英文中學會考試題預習專欄
劉玉領。
GEOGRAPHY (18) {
地理科 (十八)
29. Explain briefly, with the aid of diagrano, how
ach has been formed: Block Mountain, Fold Moun¬ tain, Residual Mountain, Volcanic Mountain.
Quote an actual example for each,
Ans. Block Mountain
- Block nowtains may be formed by the uplift of land between faults or by the subsidence of land outside the faults, or by both acting simultaneously. The vertical dis- placement of rock masses is caused by forces which are essentially radial to the surface of the earth, downwards by gravity and upwards by pressure; but the faults along which rock masses are uplifted are formed mainly by la- teral forces which create trasion in the surface rocks thus forming cracks. The Vosges and Black Forest Mountains are good examples.
Fold Mountains- as a result of compressional forces in the earth's crust, usually along well-arked zones which indicate lines of
weakness, layers of sedimentary rocks which
have accumulated in large depressions may be
豐
bent or crumpled to form wrinkles' or 'folds'.
-
area of
Examples are the Himalayas, the Rockies, the Andes and the Alps. Residual Mountain Residual mountains are also known as mountains of denudation'. Owing to dif ferential erosion and weathering, an highland, on account of its high resistance. may remain standing above the general level after the surface or the surrounding area has been lowered by denudation. The resultant land- form is referred to as a residual mountain. Examples are the Highlands of Scott and, the Sierras of Central Spain and the Mesas and Buttes of the western plateau lands of U.S.A. Volcanic Mountain - A volcano is a hole in the earth's crust through which are ejected molten rocks, ashes, gases, stean and other materials.
vent fall around Materials thus ejected from a
the hole or the crater and gradually build up a roughly conical mountain or hill. The ge mountains are also teamed Mountains of Accu- pulation. Fuji Yama in Japan, Vesuvius in Italy, and Stromboli in the lediterranean examples.
Zvezda je biodh meres
dawn
Formation of a BIOGR MIERULO
Sedimamiary deposits in a depressian
Sedimentary deposits beginsing to swati
sea
Folds appearing above Sea level
Formation of Ford mountains
Phu middle at tha
WAH KIU YAT PO
日
:30. with the aid of diagrams, describe the forma-
tion of three common features to be found in the lever course of a river.
Ans.
In the lover course of a river, the | action of running water is almost entirely constructive. Oving to the negligible gra- dient of the land, it passes through and the heavy load of silta it carries, deposition takes place. The valley becomes so open that its sides are barely discernible and the river meanders through the flat land. The most common features associated with this part of the river are oz-bow lakes, levees. and deltas?
Levees: The current of a river is glow-l est at the sides and the bottom because of its retardation due to friction. This slackening of speed at once results in šilt deposition at the river bed as well as on the two banks. After a long time, the bed of the river is raised. The river now flows at a level higher than the surrounding plains on either side between raised banks or embankments which are known as levees. Or-bow Lake: As the gradient is very small in this section of the river, emphasis is more on siue-cutting than in dom-cutting even though both are on A mall1 scale. The river begins to sing from side to side in wide loops as it progresses across the flat country. The meander is continually be ing accentuated by the river itself, since on concave side of
curve the bank is worn away by the current whereas on the convex sidə solid material is deposited. Ultimately the meander may foru almost a complete circle, and the river will cut across the narrow strip of land and straighten this part of the cour sa again, leaving an ox-bow lake which has a horse-shoe shape.
Delta:
a
natural
With a bigel såd enters sea where strong tidal curpents care absent, deposition may buildolta,
The river tends to block up i.3 outh. Chacing of the river channel will lead to Braiding and the formation of distributarie,
the sea.Each distributary disposes of its load by extending
Leveeg lot the
80 that the nitial form of most deltas is lobate (Stage a). The natural `levees projecting seawards along the sides of the distributaries are converted into curved spats of silt according to the preva ling long-shors drift in the sea imediately offshore (Stage b) These spite eventually una te ana enclose areag of central lagoons (Stags e). Lastly, the area of the delta is increases isterally by further deposition, particularly på Longshore drift, thua creating the. DOTAVAT Qisste fore. A delta, 10. offer.. SUAVETO "Extension of a flood, plain.
Lormes builtaf
ONG KONG
mange dy rivara arr.)
(G)
toe
六期星
日二月三年八六九一曆公年七十王國民中
1968
會考試題到習書力
化學科
(十八) 複習題十八
林錫衡•
複習項目定性分析與鑑別法(二)
(I)試以簡單化學方法鑑別下列各組化合
物並附有方程式
(1)碳酸鈉、碳酸氫鈉
(2)氯化鈉,溴化鈉,碳化鈉 (3)氯化鉀、氯酸鉀
(4)硫化鎂、硫酸鎂,亞硫酸鎂 (5)硝酸鈉,亞硝酸鈉 (6)硫酸盐酸 硝酸
(II)填寫下列離子的橘色反應結果
離子 Na+ 1 【烟色!
Cat
Sp
Ba | Cu
(四)填-
下表
$3 | 20° Pby Matt Felt F 離子
加氫氧化
鈉溶液得
沉澱粉色
(四)將下列離子分為兩組
CO,SO,SO, CI-NO5,POS, NCOST
00組,加稀硫酸微熱之有氣体產生者
內組 加稀硫酸微之無氣体產生者
(四)一固体樣品A當加入氯化銅溶液於其 溶液時生白色沉澱B再加醬酸则沉澱 電處去將A加以稀硫酸生刺鼻臭氧体C ⁑通入高錳酸鉀溶液中,令溶液自紫色
轉乘色且溶液澄清。C通入重鉻酸鉀溶 液中使溶液自棕色轉綠色.C遇濃的藍 色石蕊試紙則試紙轉紅色稍後退色樣 品之溶液加氢氧化钠溶液生绿色膠狀! 沉澱口加硫氰化钾溶液無特殊颜色出 現加赤血盆K-GFe(CN)6則生膝氏鼗沉澱
E.
B 是
PUINIC LIBRA
Formatia
Ox-Bow Lake
foreca
lafiting a lactation
Jeo
故知A含
故
A 是
離子。
E是
A含
離子。
(II)一樣品溶液x加硝酸银溶液生白色沉 澱A,此沉澱見光變紫灰色加硝酸不溶 加氨水則溶去,將x加稀硫酸無氣體產 生,但加濃硫酸及二氧化錳加熱則生黃 綠色氣体B.將X溶液加氨水初生浅蓝 色沉澱C氨水過量沉澱溶解成深藍色 溶液D烀X溶液通以硫化氫則生黑色 沉澱E原物燭色反應呈藍綠色。 A
口是
B 是
E 是
複習題十七解答
----LereRA
J
Developmmat di arisi
(二)(1)二氧化碳CO2
(2)氫H2
kara layar
Questions for next week
31. Distinguish between weathering' and
*denudation'. lást the chief agents of weathering and tell how each works."
32. Volcanios, granite and porphyries are well
represented in Hong Kong. Suggest a mode
of formation for each and discuss the effect they exercise on relief.
What other rock types are present in Hong Kong ? „State where they can be found.
(3)硫化氫H2S
(4)氧化氫HCl
(5)二氧化硫 502
(II)(A) (1)硫化亚铁、硫化氫,硫化鉛
(2)二氧化锰、氯
(3)氧化銅
迟)氧化鈣,白氧化鋅氧化鎂
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日四初月二年夏
WAH KIU YAT PO
銀
纽