How is rain formed? [2 MARKS]
How is rain formed? [2 MARKS]
Explanation : 2 Marks
(i) When water bodies are heated during the day, a large amount of water evaporates and goes into the air. Some amount of water vapour also gets into the atmosphere because of various biological activities.
(ii) This air also gets heated. The hot air rises up carrying the water vapor with it.
(iii) As the air rises, it expands and cools. This cooling causes the water vapor in the air to condense in the form of tiny droplets.
(iv) This condensation of water is facilitated if some particles could act as the ‘nucleuses’ for these drops to form around. Normally dust and other suspended particles in the air perform this function.
(v) Once the water droplets are formed, they grow bigger by the ‘condensation’ of these water droplets. When the drops have grown big and heavy, they fall down in the form of rain.
Explanation : 2 Marks
(i) When water bodies are heated during the day, a large amount of water evaporates and goes into the air. Some amount of water vapour also gets into the atmosphere because of various biological activities.
(ii) This air also gets heated. The hot air rises up carrying the water vapor with it.
(iii) As the air rises, it expands and cools. This cooling causes the water vapor in the air to condense in the form of tiny droplets.
(iv) This condensation of water is facilitated if some particles could act as the ‘nucleuses’ for these drops to form around. Normally dust and other suspended particles in the air perform this function.
(v) Once the water droplets are formed, they grow bigger by the ‘condensation’ of these water droplets. When the drops have grown big and heavy, they fall down in the form of rain.
