1979-06-22 — Page 32

頁四第張八第日八廿月五年未己展复

1979€

中學會考試題預習專欄 地理科建議參考資料

明德出版社提供

SECTION A

GEOGRAPHY

(2) Haze of the Back

Granito...

(b) Description of the Beck

A plutonic imesus rock light coloured, consisting mainly of quartz, erthoclas feldspar and biotites. The

chemical composition is ma ked-

ly acidic (65 75% silica) 五七 armed by the coolin盒

and solidificati

îox af ma er

nside the Verust,

large deep down Due to the

cooling, large ium crystals, which are Well-interlocked, are resulted Joints are well developed,

deve

Weatherine. Process that has brought about the file

iagram shows a fully weathering profile

( Spheroidal:

ja taking place. easily subjected

weather

eratures

rainfall is abun ter, which disselv diozide în the becomes mild acid ore, quickens the rat

cal weathering,

ain water pesebrètes

ther

the

ore de

WAH KIU YAT PO

colour as stained by the iren oxide. Perhaps the weathered debris may be washed away;

leaving the core atomos behind to pile up as tors.

(a) Description and explanate

ion of the variations: River Flow from Source to Month

The graph shows that the Deaz velocity of the river încréases downstream. It is because the valecity of a river is affected by, not only its uradient, but miso many other factors like the width and depth of the chas its discharge, and the

ess of the river bed.

In the upper course of this particular river,

river chauvel is harron

The

likely to be shallow, thes the discharge is small. river bed is also very un as broken by rpaidsy water- falls, potholes and plunge poels. Mach" energy consumed to overcome these irregulari tea. is therefore reduced.

as to be all

Velocity

As the v_lley videns in ita lower conrse, the discharge incrbasen. The velocity is further increased by the smoothness of the river bed, which reduces the frictional drag

(b) Centrast of the Work of

River Erosion in the Unper and Lozer Courses of the River

Since water in th Cause is

報日僑華

五期星

river may swing freely, cevelop into loops, which will further develop into meanders.” In- stead of active docncutting, undercutting at concave banks predominates. The river channel i thua videned, rith depos î tion features of finer particles.

3.

Reasons for the Aridity in the Interior part of Queens land.

The aridity of Queensland is mainly a result of its lecation and relief

land is situated in the trop- ical region, within the s. Trade Wind Belt. Its eastern coast is backed by an old fold zountain – the Great Divide, voich runs parallel to the coastline and herefore, foræs. a barrier to the moisture- ladem S.E. Trades and N.E. onsuore vinds.

Rainfall in depeeited nainly on the wind- ward slope, while the interior of Queensland becoms the rain shadow area. Wind descends on this leeward side, and is therefore compressed and becomes dry, The aridity further intensified by ita motoxess from the sea.

Dne the absence of maritime influence, continentality is marked.

Fürthermore,.

the

high temperatures and high

is

rat

Tate around the tropic can also account for' In vinter, it its aridity.

yasi 日 ciall ler the influence of the

se Latitude High Pressure

Winds bler effehere. this high pressure, and thereforG GEY-

are

cutti Particles

channel.

the headwar

floor is als

(b) Form of Underground Water

in' the Aren

In this interior part of Queensland. undergrond water be obtaimid from artesian

日上廿月六年7

2日二廿月六年九七九一路公年八十六國民華中有救盘華

the water.

bearing lay

5. Aquifer

VA IMPERMEABLE ROCKS

BOM PERMEABLE ROCKS:

FIGURE 1.

4. Water Table's

DOM

pumazijapan

2. Sunclinal.arrangement

Orthian wali prended that ↑

Than the ferti. A WIT,

• Wasir gushes out from the

"Rocks hip to an

area of imper

munde rocks:

GUREZ

Name of the Weathet Phenomenon

Typhoen

(b) Weather Conditigas 01 HE on those 3 Days With the approach of the typhoon "on the first day,

the

ligh

Clouds

grainal drop in

The condition

there was OKLY The weather was hot and humide Cew and high:

Becond, day,

closest and

rtex.

the

apped rapidly.

hurricane force

(perienced.

vercast, and stured by torrea-

savïent

surface

fored

aletely weathe

erite ssils,

sh to yellowish

唯

山海之友

abrasion Brosiesal features like ids and waterfalls are

esu teď.

the levar course, water

fer and guetler

(c) Annotated Diagram to show the Formation of Artesian Vells

It can be either Figure

(sid

As the grad eat is reduced

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