Emmanuel

Geograpphy Sec Sch

STRUCTURE OF THE EARTH

The structure of the earth is grouped into two zones: The outer structure and the internal structure.  THE OUTER STRUCTURE OF THE EARTH The outer structure of the earth is made up of four zones or layers: Lithosphere Hydrosphere Atmosphere Biosphere Lithosphere: This is the solid portion of the earth. It is the outermost zone […]

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Geograpphy Sec Sch

CALCULATION OF DISTANCES AND LOCAL TIME

Calculation of distance using lines of latitude Procedures: locate the two places involved find the latitude difference between the two places Note:    North-North= subtract North-South= add South-North= add Equator-North= add or subtract Equator-South= add or subtract multiply the latitude difference by 111km 1°=111km( 1° of latitude is approx. 111km on land)   Example 1

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Geograpphy Sec Sch

LATITUDE & LONGITUDE

MEANING OF LATITUDE Latitude is an angular distance of a point on earth’s surface measured in degrees from the centre of the earth. Latitude is parallel to the equator .Equator divides the earth into two equal halves known as Northern & southern hemisphere. Lines of latitude are sometimes called parallel of latitude.   IMPORTANT LINES

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Geograpphy Sec Sch

EARTH AS A PLANET

The shape of the earth The earth has a spherical shape. Its shape can also be described as GEOID. Though we walk on “flat” surface, it is almost like a sphere and it is slightly flattened at the two poles. There are many facts to prove that the earth is spherical. Size of the Earth

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Geograpphy Sec Sch

INTRODUCTION TO GEOGRAPHY

INTRODUCTION TO GEOGRAPHY:  MEANING, SCOPE AND VALUE MEANING OF GEOGRAPHY The word Geography is derived from the Greek word ‘Geo’ meaning the earth, and ‘graph’ which means description. Geography can therefore be defined as the description of the earth. However, Geography does not only describe the surface of the earth and its features. It also

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Geograpphy Sec Sch

CLASSIFICATION OF CLIMATE

GREEK SYSTEM OF CLASSIFICATION OF CLIMATE This is one of the earliest climatic classification which was made by the Greeks. The basis for the Greek classification is temperature. This system of classification divides the world into three climatic zones. These zones are: Torrid zone: This zone is found within the tropics. It is very hot

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Geograpphy Sec Sch

CLIMATE

Climate is the average weather condition of the atmosphere over a long period of time usually about 30-35years.   FACTORS THAT CAN AFFECT OR DETEMINE CLIMATE Latitude 6. Cloud cover Altitude 7. Vegetation Distance from the sea 8. Planetary wind Ocean currents   Elements of climate Temperature Rainfall Wind Relative humidity Pressure Cloud cover Sunshine

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Geograpphy Sec Sch

ACTION OF WAVE

The action of wave as an important agent of erosion, transportation and deposition of material is confined to the coast of seas and oceans. The rate of marine erosion depends on the nature of the rocks, the amount of rock exposed to the sea, the effects of tides and currents and human interference in coast

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Geograpphy Sec Sch

ACTION OF GLACIER

The action of glacier is an important agent of erosion, transportation and deposition in temperate regions or mountainous regions.   TERMS ASSOCIATED WITH GLACIER Ice: This is solid form of water which results from freezing when the temperature is below 00 Snow: This refers to frozen water vapour that falls in form of crystals from

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Geograpphy Sec Sch

WIND IN THE DESERT

ACTION OF WIND IN THE DESERT The action of wind is dominant in desert and other semi arid regions of the world. Deserts are places with little or no vegetation. Deserts which are associated with aridity (dryness) are caused by low rainfall, high temperature, cold currents and high evaporation rate. Examples of Deserts are: (i)        

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Geograpphy Sec Sch

RUNNING WATER (RIVER)

ACTION OF RUNNING WATER (RIVER) Running water is one of the most important agents of denudation. Rivers are involved in erosion transportation and deposition of materials. TERMS ASSOCIATED WITH RIVERS (1)       Source of a river: The source a river refers to where a river starts or begins, usually around highlands. (2)       Course of a river:

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Geograpphy Sec Sch

WORLD TRADE

Trade is the buying and selling of goods and services between one region and another, within the same country or between one country and another.  The former is known as internal trade while the latter is called international trade.   Types of Trade International Trade This trade is divided into two groups.  They are: Import

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Geograpphy Sec Sch

ECONOMIC CO-OPERATION OF WEST AFRICA

International Economic Co-operation of West African state (ECOWAS) The economic community of West African states (ECOWAS) is a sub-regional organization formed by West African countries mainly to promote co-operation and development in all economic fields and to contribute to the progress and development of the African continent.                                                       ORIGIN OF ECOWAS The treaty

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Geograpphy Sec Sch

CLIMATIC CHANGE

Climate Change Meaning and Nature of Climate Change Climatic change refers to large scale alteration in the normal cycle of weather over pronounced time or duration.  This change or alteration is expressed in the irregularities (anomalies) of the cycle or regimes of major elements such as rainfall, solar radiation, temperature, pressure patterns and all-other elements

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Geograpphy Sec Sch

MASS MOVEMENT

Mass movement can be defined as the movement of weathered materials (regolith) on slope under the force of gravity.  It can also be referred to as the movement of rock materials from one place to another under influence of gravity.                     FACTORS THAT AFFECT MASS MOVEMENT These are factors that affect mass movement Gradient

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Geograpphy Sec Sch

WEATHERING

Weathering is the disintegration and decay of rocks which is caused by forces of weather such as frost, rain and temperature changes. It can also be defined as the process by which rocks are broken down into smaller fragments by weather forces/atmospheric forces. It is a process of rocks breaking and decaying which are caused

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Geograpphy Sec Sch

DENUDATIONAL PROCESSES

Denudation is the process of lowering or sculpturing the earth surface by the activities of certain agents called denudation.  The word denude is an original Greek word for reduction, that is, lowering or cutting.  Therefore, denudation process are processes that contribute to lowering or reshaping the earth.   Types of Denudational Processes Denudation involves four

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Geograpphy Sec Sch

LIMESTONE

LIMESTONE (KARST) REGION Meaning: Limestone or Karst region (Fig. 38.10) refers to a large stretch of land occupied by limestone which possesses a unique type of topography. Limestone is a sedimentary rock of organic materials made up of calcium carbonate.                                   Characteristics of limestone region Solubility: Limestone is insoluble but is made soluble by

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Geograpphy Sec Sch

VOLCANICITY

Volcanicity is the ejection of solid, liquid or gaseous materials from some deep-seated reservoir of molten magma beneath the earth crust to the earth surface. Volcanicity is defined as the rising of molten magma or other gaseous materials beneath to the surface of the earth or within the earth crust. Volcalnicity can be referred to

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Geograpphy Sec Sch

Regions of Earthquake Occurrence

POPULAR EXAMPLES OF DISASTROUS EARTHQUAKES Africa is generally free from earthquake except along the edge (Morocco, Algeria and Egypt) where some earthquake have been recorded. In East Africa, some major earthquakes have occurred in the rift valley zone e.g. Tanzania, near the shore of Tanganyika in the December 1910 and in Kenya in January 1928.

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