i heard this in a song, is this true?

Question

Now if you take a glass of water then add two cubes of ice
you should see the cup's water level slightly rise, right?

If you remove every living animal out of the sea
then wouldn't the world's ocean water level decrease?
This means the planet wasn't three-quarters water

Answer 1

Um, water would still take up 2/3 of the Earth because though the animals contribute greatly to the rise and fall(if you take them all out) there'd still be the same amount of water, just a different sea level. Look at it this way: you have one cup of water, you add an ice cube, the water goes up. Right? But, there is still one cup of water in there. You take the ice cube out, the water level goes back down, but there's still one cup of water. Now, imagine this metaphor with the ocean and the animals. Hope that clears things up.

Answer 2

What you are referring to is buoyancy, which we have a better understanding, thanks to Archimedes running through the street naked shouting "Eureka." (True story according to history.) Archimedes found that a body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid. If you remove all the life in the oceans, then you are removing density from it, and the sea levels certainly would drop somewhat. Exactly how much, I couldn't tell you, because I haven't calculated the density of all the life in the ocean on my days off. However, you should also keep in mind that most life is also made up of mostly water. (90%) As mentioned earlier, it is indeed that water covers roughly 2/3 of the surface area of earth, and not that the planet is actually made of 2/3's water.

This same priciple of buoyancy is called isostacy when it comes to land masses. Continents are less dense rocks "floating" on more dense basaltic oceans. As the shape of our continents and oceans change, so will sea level.

Answer 3

The water level would decrease, but not by enough to matter at all, it would be like taking a needle out of your glass of water, you wouldn't even be able to see the decrease because the volume of the oceans is so vast.

Answer 4

Yes and no. Leaving out one enourmous factor, global warming and the fact that the ice caps and glaciers are melting every year so, the water level would decrease slightly, but not to a significant amount that would outway the level of which the ice caps melt per year.

Answer 5

The level of the water might go down, but it would still take up the same amount of surface area

Answer 6

Earth is about 70% water and 30% land. Animals of the sea don't make up for that 40 percent difference. But it could change a little, I guess. Good question!

Answer 7

I think with the 2/3rds thing they are referring to the area it takes up not the volume of water compared to the land's mass. Water takes up 2/3 of the world's suface area.

Answer 8

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Answer 9

sounds good to me

Answer 10

true