Ajayi Tunde. J

This is the prediction of the conditions of the atmosphere for a given place for a certain period. Methods of Weather Forecasting Traditional Methods – Prediction of weather based on traditional beliefs and facts. Plants shedding leaves indicates period of…

The force exerted by gases in the atmosphere on some area or body on the earths surface. Measured using barometers of three types namely mercury, aneroid and Fortin Barometers How It Works Air exerts pressure on the mercury in the…

Direction Wind direction is determined using wind vane. How It Works As the wind blows the arrow swings. The arrow points in the opposite direction of the wind flow. The direction is read from the cardinal compass points. The arrow…

Humidity is the condition of atmosphere with reference to its water content. It’s measured with hygrometer or psychrometer which consists of wet and dry bulb thermometers kept in Stevenson screen. Dry bulb thermometer is a thermometer covered with muslin bag…

Duration of sunshine is measured using Campbell stokes sunshine recorder. How It Works Spherical lens focuses light on sensitized paper. The paper burns when the sun is shining. The total hours of sunshine is got by adding all the burnt…

Rain gauge is the instrument used to measure the amount of rainfall in a day. It should be made of impermeable material which can’t absorb water. How It’s Used/Works It’s taken to an open space to prevent water from dropping…

Degree of hotness of an object or a place. It’s measured using 3 types of thermometers namely: Maximum thermometer Minimum thermometer Six’s thermometer Maximum Thermometer It’s used to measure the highest temperature reached in a day. It uses mercury. How…

A white wooden box mounted on 4 legs used to house thermometers and hygrometers. The instruments which are found in it are: Maximum thermometer Minimum thermometer Six’s thermometer hygrometer-wet bulb and dry bulb thermometer Importance Provide shade conditions for accurate…

Daily atmospheric conditions of a place at a particular time. Elements of Weather Temperature Humidity precipitation Precipitation Atmospheric pressure Wind Sunshine Cloud cover A Weather Station -A place where observation, measuring and recording of weather elements is done Factors to…

a) The Atmosphere Layer of gases surrounding the earth. The earth revolves with it because it’s held onto it by gravity It’s about 330km thick. Composition of the Atmosphere a) Gases-exist as a mixture b) Smoke particles c) Dust particles…

Internal Structure of the Earth The evidence used to study the earth’s interior are mining drilling quarrying/excavation Crust/Lithosphere Outermost layer of the earth Made of soils and other loose deposits of sand The dominant rocks are granites. Extends 0-50km Has…

Movement of the earth in its orbit around the sun. It’s in anticlockwise direction. The orbit of the earth’s revolution is elliptical. Takes 365 ¼ days in a year or 366 days in a leap year (every 4 years). The…

A star with a greater gravitational pull passed near the sun. It attracted large quantities of gaseous materials from the sun. The materials split, cooled and condensed. Heavier materials collected at the centre to form the core. Less dense materials…

The time recorded in places within the same longitude. A longitude is an imaginary line running from N to S which shows how far E or W a place is from the prime meridian. Greenwich Meridian (0◦) longitude is the…

Any natural heavenly body that orbits around a planet e.g. moon for earth, tritan for Saturn and triton for Neptune. Asteroids/Planetoids Also called minor planets. Are small fragments of rocks left going around the sun when the solar system was…

The Sun It’s the centre of the universe. Characteristics of Sun It’s a star. A star is a heavenly possessing its own light which it transmits. Nebula/galaxy is a cluster of stars. The earth is in a galaxy called The…

Solar system is the group of heavenly bodies comprising the sun and the nine planets. The origin of the Solar System Theories A theory is a set of reasoned ideas intended to explain facts or events Passing Star Theory A…

Facilitates good relationship among nations by studying geography of other regions of the world. it’s a career subject in that it enables one to go for advanced studies in specialized fields e.g. geography teachers, meteorology, surveying etc. Enables us to…

 The Meaning of Geography Scientific study of the earth as a home of man. Study of interrelationship on natural and human phenomena on the earth’s surface. Environment The surroundings All external conditions surrounding an organism which has influence over its…

Mining is defined as the extraction and processing of mineral resources into finished products.  Mining of Gold South Africa is the largest producer of gold in Africa, followed by Ghana, Zimbabwe and Zaire. Major mining areas include: Witwatersrand near Johannesburg…