1971-11-14 — Page 14

莫二張四第日七廿月九年亥辛歷宴 WAH KIU YAT PO..

1972英文中學會考試題預習專欄。

堅道英文書院主編

地理科

(二)

GEUCH A PHY

Source materials

Pebbles

Sand

2mm

10.06

0.06-0 00. AND

報日僑華

日期星日四十月一十年一七九一圈公年十六國民華中,育教儒華

present time.. The unequal rate of cooling. would lead to the: formation of wrinkles on toe. earth's surface and it is believed that such wrinkles are in fact fold mountain range8.

SUB-CRUSTAL CONVECTION CURRENT THEORY - this theory was proposed by a famous British geologie called Arthur Holmes.肮 He suggested that there care convectional currente, operating inside the

earth's crus t due to temperature difference, The core region would send up convectional

currents to the mantle region since the former which 18 10 molten stage has a higher temperature inen the latter. The sub-crustal currents would. exert a compression as well as tensional force. on the crustal region and so the continental faces pulled up by the compressional

to form ford moutain.

ranses.

筒䱵會繁校校監王將生技封。(本報:香椒) 「任彭東之夫人與畢業生代表。左:東 其驱同鄉會學校泒深微,藏右九京城民政主

1972

(b)

Mud

account for the formation of mechanically :formed sedimentary rocke.

Attempt a classification of sedimentary rocka according to their grain size.

"aaa, fa) Sedimentary rocks are composes of fragmenta and particles derived from older rocks 0 10- carried by ourreate of water or air to a budy of standing water, a valley floor, or a pow plain where the particles become subject to the processes of compaction, cementation and hardening, 201 that eventually they become, sol rocke Three principal sub-divisione of Bedi mentary rocks can be made on the basis of ine: origin of the rock particles.

(A) MECHANICALLY FORMED sedimentary rocks.

(e.g. sandstones, shales and grit). (B) CHEMICALLY FORMED sedimentary rocke

(e.g. limestones, rock salt and gypsum (C) ORGANICALLY FORMED sedimentary rocke

(e.g. coal, limestones, and chalk).

Mechanically formed sedimentary rocks are derived from rock fragments produced by weat ering. The rock fragmenta thus obtained may be swept up by running water or by wind to remote territories. All the sediment, even tum ally finda 119 way to the sea, where it may be deposited in-layers. As time goes on, compaction due to the weight of the overlying layera: above which couples waith the cemediatio. of fine particles togetner by silicave and calc ium carbonate will form solid "rock,

(b) auinougn sedimentary rocks usually cobtain

particles of several different grades: and not all of the same size. (e.g. conglomerale may contale a fair proportion of sand or silt), tt pen; be claess fied according to the predou. inant 6156 of the part, las of which they janë coaposed.

Sedimentary rocks, with the largest grain Biz 18 known as conglomerate or breccia. Their grain sa ze being in the region o112 mm. Conglomerate is formed by cementation of pebbly. deposits or gravels. The term bfedera 19:2 to cemented deposite of coarse angluar rock. fragments.

*'

' Sandstones are composed of materrals with grain" aize between 1-0,06 mm, sandstone and siltstone are composed of sand and Bilt particles respect.

Sandstone grains may be. composed of Ively. any hard minerals which in most cases would. be quart 20

Mechans cally formed. sedimentary rock that has the finest grain size is Krown as shale. The rock forming particles are compacted unde great pressure and is composed of clay and mud. io Hong Kong: we can find anale in Peng Chaw Mara: Bay.

心

HAW MATCHLALS.

Pebbles

Sand:

Sil

clay.

MABLE!

DCHANICALLY FORMED SEDIMENTARY

CONSOLIDATED ROCKS.

Breccia

Conglomera好

Grity

-Bands tone

511tstone

Muds tone,

shalo

OCEAN

OCEAN

Jo a certain extent, this statement may seem to be true. The highest mountain ranges in the world e.g, the Hinglayas, Alpe and Andes are formed in the Alpine (about 40 million years before present.) However, there are also. fold mountaina besides the above mentioned ones, and such, mountains loclude the Scottish Highland and the Appalachians. These mountaing which are formed in the Caledonian Period (330 million yeare before present) are lower in elevation. and Leos rugged than the Alpine fold mountains, Due to the fact that they came into existence for a longer period than the Alpine fold moun-i taina, therefore, they are subjected to action. of various agents of weathering and erosion for a mucn: Longer time. Consquently the young fold mountaing which suffered comparatively amall: amount of weathering and erosion will form the aighest peaks in the world.

STAGES OF THE EVOLUTION OF FOL

(1)

(III)

From the accompanied map, one can see that the distribution of the world's fold mountain ranges 18 very uneven, Most of the world's young fold mountain ranges are found alonga The continental: borderiands, we can:classity the

·young fold mountain ranges invo systems according to the areas where:

two worlds

they are found...

(1) The circum-Pacific Belts'-

this syetem

includes ranges such as the Rockies, Andea and mountain ranges in the Japanese as as the Aleutain Island Arce.

(11) The Furasian Belts → this system includes

the Alps, the Himalayas as well as the mountain ranges found in South-east

(B)

WORLD DISTRIBUTION OF YOUNG FOLD MT

(II) (a) 4000unt for the formation of fold mountains. The highest mountains in the world are also the youngest," Dascusa. this statement.” (o) With the aid of a world map, describe the

world distribution of fold mountain ranges.

There are many theories that tried to explain the origin of the world's fold mountain ranges but among these there are few acceptable: ones and.these.includes ''

Thermal contraction theory: Sub-crustal convection theory.

THE THERMAL CONTRACTION THEORY:- trise to explain

the formation of föld mountains. In terms of contraction of the e earth's crust due to unequal rate of cooling experienced in the crustal region, the mantle, and the core. It is argued. that cooling of the earth'e layers has took place ever since the earth was formed. The rate of cooling differs from layer to layer. The crust has the highest rate of cooling since 2t 18 exposed to the atmosphere and the core remains to be in molten form even up to the

Answers to lànt

QUESTIONS FOR "NEXT" WEEK:

1)At molame: fication, of planas according to

their mode of formation.

II)

With actual exampiea, describe the usefulness of plains to agricultural activities.

中文中學會考試題預習專欄

化學科

復習一解答 1.填-

題

(1)化學变化 或化學反應 (2)物理变化(3)氧[] 氧能助燃,故大类倍加明 亮。木條在氧中燃燒產生 二氧化碳,二氧化碳能使 澄清的石灰水变成混濁。 (4)二氧化碳因二氧化碳不 能助燃,故火焰熄滅。 (5)氣氛不能然,故大

·燄熄滅,氣與石灰水無作用

·故石灰水不生混濁的沈澱 (6)氨氮不能助大熊,但能燃 燒;其火燄為青藍色;生成 物為水;無水硫酸銅能 吸收五個結晶水而成為 蓝色的膽礬。(7)一氧化 碳。打一氧化碳不能助 燃放焰熄滅;但能燃

燒,其火焰菜為青蓝色產物為 二氧化碳;因無水份故無水 硫酸銅颜色不变。二氧化碳、 能将石灰水变成混濁。 (8)發生爐 煤氣)為混合物。 (9)無水酒精)為化合物。

(或黄钢鸟)混合物。

(11)(精鹽為)化合物。

(12)(水銀為)元素

陳新

(2). 答:能改变化學要化工建 度,而本身不發生化學变化 的物资叫做催化劑街 將氣酸钾加热,预热至 400°C左右,才有氣發生若 加入黑色的二氧化锰粉 末,則热至20°C時即有氧 發生。

(3)答影響氣体溶解於液

体的因素

(一)與态劑的性質有關: 例如在標準狀況下一公升 的酒精能落二氧化碳比水. 多兩倍率

(二)温度愈高,液体溶解 氣体的量使愈少。例如將洗 水加热,氣体更大量排出。

(三)與氣體本身的性質有

問,例如孰極易溶游水, 硫化氢頗能溶於水,而 氣则微溶解於水

與氯体及液体相互之性 質有問。例如二氧化硅溶 於水較易於酒精

壓力愈大,則氟体的浴碍 量亦愈大。例如二氧化碳少

高壓浴入汽水中若打開瓶

蓋壓力減小,則氣泡大量逸

P為物理变化,C為化學变 .計算题

化

刘碘片受热昇案(13) 上

(6)器生锈(14)C (C)鍊 【稀硫酸中(15).C (d) Dosk te = 6th (16) C (E) 白紙置於空氣中日久变 (17) C

(18)結晶水(19)潮解(20)風

1.選擇題

)(e) use 96 (2) (c) ★ € (3)

(2)除去二氧化碳(4)(b)黃 磷(5)()(任何方法不能分

解成再簡單的物質。

III問答題!

(1)答空氣為混合物的理由 :(一)空氣裏的氧及氮雖然 混在一起但彼此仍然保 持原有的性質,兴那些承体

工已知:洗濯打冷子

** Na, co2 10HO.

正求:所含結晶水3百分

重量組成。

III:解:(A)原子量:Na=23, C-12, 0=16, !

Na, CD; • JOH2OSTER.

23*2+12+1633+10(142+16) =286

106 +180=

()所含結晶水之百分率為:

180

286*100%=62.93%. ̇洗潔歐打含結晶水6293

Waio=1589

I te Cut

成

百分重量組

單獨存在時的性質相同。 III解:(一):重為:

中的比例混合時並無光 迅等化合現象產生。

(三)使忆氣谷於水中再

將其放出,則氧及新体 積,比共在空氣中的比例 不同“若為化合物則應相 同

(四)將空氣凝為液体,再使

升全其後則嵐

転光行輝發若為化合物 則方同時揮發

0.329

(=>(1)三重量百分率為:

10 x100%

wo 589

-79.77%

(I) 0重量百分為:

Wo

0.329 Ex100%

3%8

氧化铜所含銅重79.7%

所含氧重20.3%

-復習一解答完