Ajayi Tunde. J

METHODS OF COLLECTING DATA (STATISTICAL TECHNIQUES) Observation Use of eyes to observe features or weather then information is recorded immediately e.g. cloud cover, rocks, soil, land forms, vegetation, etc. Advantages Gives 1st hand information which is reliable. Relevant material to the study is collected. Time saving since one doesn’t have to look for data in […]

Statistics – numerical figures collected systematically and arranged for a particular purpose. Statistical data-information presented inform of numbers e.g. No. of students in a school Mean daily temperature of a place Amount of milk produced daily from a farm Amount of money earned from exports annually. Statistical methods-techniques of collecting, recording, analyzing, presenting and interpreting statistical

Cyclone It’s a low pressure system characterised by low pressure at the centre and increases outwards. Starts in areas where air ascends from the ground to the atmosphere and descends at high altitude. It’s of two types. Tropical cyclones e.g. hurricane, typhoon and willy willies and depressions which are characterised by temperate latitudes. The movement

Are a mass of tiny droplets or ice particles formed when water vapour condenses. Three Cloud Forms Cirroform -Thin and wispy clouds composed of ice crystals. stratiform -Appear as greyish sheets covering most of the sky and are rarely broken into units. Cumuliform -Are massive rounded with a flat base and limited horizontal extent and

Distinct large parcels of air moving in one direction. Originate from areas of uniform weather and topography from where they derive their characteristics e.g. flat areas, forests, deserts, and snow covered areas. Characteristics of Air Masses A large volume of air. Covers an extensive area. Has uniform temperature and humidity. Distinct from the surrounding air.

Mist and fog are a mass of tiny water droplets suspended in the lower layers of the atmosphere. Fog is denser than mist i.e. has more moisture. Both hinder visibility although fog reduces visibility to less than a kilometre. When fog mixes with smoke its called smog. How They Form Moist air cools below dew

Factors Influencing Atmospheric Pressure Altitude: Pressure decreases with increase in altitude because the column of air becomes shorter hence it exerts less weight. Temperature: When air is heated it expands and exerts pressure over a large area resulting in reduced pressure. When it’s cooled it contracts and exerts pressure over a small area resulting in

Relief/Orographic/Mountain rainfall Rain experienced on the windward slopes of mountains or hills formed when moist air is forced to rise over a mountain or a hill. How it Forms Moist air is forced to rise over a hill or mountain. The temperature and air pressure decreases making it to expand. Air cools due to decreased

Relief/Topography Relief features such as mountains and hills results in the rising and cooling of moist winds to form relief rainfall. Aspect Windward slopes which are on the path of rain bearing winds receive heavier rainfall than leeward slopes which face away. Forests and Water Bodies Areas near forests and large water bodies experience higher

Affects rain formation in such as way that places with high humidity are likely to experience higher rainfall than those with low humidity. Regulates the heat loss from the earth’s surface by absorbing terrestrial radiation (process in which the earth gives off heat into the atmosphere). It affects sensible temperature in that the higher the