Ojo o et al 2001 fundamentals of physical and dynamic
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Educational Books. Ojo, O. et al(2001). Fundamentals of Physical and DynamicClimatology. Sedec Publishers. 79
AGR 205INTRODUCTION TO AGRO-CLIMATOLOGY UNIT 3ELEMENTS AND CONTROL OF CLIMATE AND WEATHER: PRECIPITATION AND PRESSURE AND WINDS CONTENTS 1.0Introduction 2.0 Objectives 3.0 Main Content 3.1Precipitation 3.1.1 Forms of Condensation 3.1.2 Forms of Precipitation 3.2Pressure and Winds 4.0Conclusion 5.0 Summary 6.0Tutor-Marked Assignment 7.0References/Further Readings 1.0INTRODUCTION Precipitation, pressure and wind are some of the climatic elements that have substantial influence on weather and climate. They are equally affected by the climatic factors earlier mentioned. 2.0 OBJECTIVES At the end of this unit, you should be able to: •know the characteristics and forms of precipitation•recognise the various forms of condensation and types of clouds•define atmospheric pressure and wind.3.0 MAIN CONTENT 3.1 Precipitation Precipitation is usually in liquid or solid form. The common precipitation forms include rain, drizzle, snow, sleet and hail. They are always preceded by condensation or sublimation or a combination of the two. Let us now look at both forms of condensation and precipitation 3.1.1 Forms of Condensation The maximum capacity of air for holding moisture may be reached if a parcel of air is cooled at constant pressure. Thus, the saturation point can 80