2. Falling rain is pure water. But rainwater was once the water in the sea, in
puddles - even in drains! So how is it made pure?
Class 6 taped a plastic bag with some muddy water to the window in the Sun,
It began raining in the bag.
The water was being warmed by the Sun. It evaporated. The water
condensed at the top of the bag. The water droplets ran together to make
drops. The drops fell as rain.
a) Why was the rainwater clean?
b) How was the rainwater made clean?
c) What happened to the mud?
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Answers
Answer:There are so many misconceptions in the world – and rainwater is no exception. When people think of rainwater, they often think of wastewater, pollutants and even balding! Do you think these ideas are accurate? Whilst such concerns might stem from a common misunderstanding, we seem to accept them as scientific fact. In this chapter, the truth will be exposed: rainwater is actually extremely clean and safe.
Let's look back on the days before pollution was such a big issue. We don’t even need to look that far back. How about the 1960s-1970s? Neighborhood children were playing in the streets, never too concerned about finding water. There was never any shortage – mountain valleys, wells and pumps were always accessible. Besides, every time it rained, they could simply look up at the sky, open their mouths and catch the rainwater!
But what do children today do when it rains? They run inside, thinking of their parents’ warnings, “Don’t stay out in the rain! Rainwater is filled with pollutants … it might make you turn bald!”
Well, why don’t we picture something else? Think of a family picnic in the park. - Groups of people sitting on the grass, having lunch with their bottles of water (“bottled water”). As bottled water goes through a ‘purifying process’, people assume it is the safest form of drinking water.
But what if I ask them to drink rainwater? Whilst they might think it a strange idea, there is evidence to show that the bottled water they are drinking actually started life as rainwater.
Yes. The bottled water that we consider to be the purest form of water actually comes from rainwater. In fact, this does not just apply to rainwater; all water, including water from taps, valleys and rivers stems from rainwater. Let’s track the root, using tap water as an example:
Tap water - Water pipe - Filtration plant - Water intake system - The river or Lake - Water from the valley - Rainwater.
See, this process ends with rainwater.
When we look at the circulation of water in the natural world, the position of rainwater is at the top of the cycle. It is possible, therefore, for us to drink untreated rainwater. This is because rainwater is pure, distilled water evaporated from the sun - nothing else.
However, when rainwater falls from the sky, substances from the air and land melt into the rainwater. Fortunately, when rainwater soaks into the ground, it then becomes mineral water. This water (groundwater) is relatively safe for drinking. However, rainwater that falls to the ground does not just get absorbed into the soil - it goes everywhere. If it falls on waste, it then becomes wastewater as it is contaminated. It can also flow through the sea and into river systems.
As rainwater disperses, more pollutants are added and the water becomes more obsolete. We then pay a high price for purifying it. This is the simple truth. It seems that the answer to this problem is obvious. The cleanest water is rainwater that has not reached the ground. Rainwater is naturally good - so we need to find a way of catching rainwater before it gets contaminated.
However, it is hard for us to imagine washing our faces or having a bath with rainwater, not to mention drinking it. But, we need to save water since water shortages are a serious problem. In addition to relieving water shortages, rainwater can prevent flooding and droughts. It can also reduce river pollution, and prevent groundwater from becoming contaminated. Moreover, we can reduce the heat island effect in cities, making a pleasant urban environment.
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Answer:
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