First of every we have to pay fist that words “drop” does no refer to any type of measurement Unit. Therefore, and because the the water cycle, the quantity of water in the seas is not constantly the same. Rivers are constantly flowing into the sea and also there is a consistent evaporation. Also so, native a mathematical suggest of view, we perform not aim at obtaining an accurate answer to this question. Our aim is to acquire an agree approach. The most important suggest of these inquiries is leading the pupil to reflect and think around an approach to the problem and trying to reach a near answer through a mathematical reasoning. Questioning how numerous drops there are in the s is the exact same of questioning how countless sand seed there are on the beaches. Or else: how numerous leaves are there in trees? just how many human being can pat the piano around the world? How many tennis balls deserve to I placed in mine classroom? No issue what the situation is, the aim is constantly the same: motivating pupils to think.

## But, after ~ all, is there any means of learning the answers?

Yes, over there is. To begin with, we deserve to admit the a water drop synchronizes to 0.05ml. The is the exact same of saying that 1 litre of water contains carefully to 20,000 drops. At the minute we are confronted with one more problem: how plenty of litres that water are there in the ocean? The complying with logical step would be advantageous to calculate the ocean volume. The is not easy due to the fact that the depth is not always the same and also besides the the sea coasts are very irregular. Us can shot an strategy by browsing the Google the will enables us to uncover that the calculation for the oceans volume is about 1335 millions of cubic kilometres, having in mind that 70% of our Planet’s surface is water. To know how plenty of litres there room we will use an equivalence i beg your pardon we room taught during the primary school: `1 liter = 1 dm^3`. After part mathematical calculations, us arrive to the conclusion that seas are created by `2.67xx10^25` drops, which synchronizes to the number 267 complied with by 23 zeros!

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