TERMS ASSOCIATED WITH RIVERS(1) Source of a river: The source of a river refers to where a river starts or begins, usually around highlands.(2) Course of a river: This refers to the path or channel through which the river flows.(3) Mouth of a river: This is where the river ends or where it enters into the sea, ocean or lake.

The action of the wind is dominant in deserts 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) Sahara desert (West Africa).(ii) Kalahari and Namib deserts (South Africa).(iii) Arabian, Iranian and Thar deserts (Middle East).

TERMS ASSOCIATED WITH GLACIER Ice: This is a solid form of water which results from freezing when the temperature is below 00C. Snow: This refers to frozen water vapour that falls in form of crystals from the atmosphere. Snow-Line: It is the lower limit of snow cover on a mountain. Glacier: This means moving ice i.e large accumulation of ice in motion. Glaciation: It is the wearing away of the earth's surface by glaciers. Snow Field: This is the region or area that is permanently covered by snow

The action of waves 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 protection.TERMS ASSOCIATED WITH WAVE(i) Wave: Wave means turbulent movement of water as a result of wind moving over the water.(ii) Tide: Tide is the alternate rise and fall of the surface of the sea approximately two times a day.

The climate is the average weather condition of the atmosphere over a long period of time usually about 30-35 years.FACTORS THAT CAN AFFECT OR DETERMINE CLIMATE1. Latitude 6. Cloud cover2. Altitude 7. Vegetation3. Distance from the sea 8. Planetary wind4. Ocean currents

The climate varies from place to place and the following are the common classification of climate: The Greek system of classification and Koppen system of classificationGREEK SYSTEM OF CLASSIFICATION OF CLIMATEThis is one of the earliest climatic classifications 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: