Think of it...?

Question

can you explain why a 0.5 g needle sinks down into the sea wgile a ton of ice floats???

Answer 1

Because the needle is more dense... Waters density is at one and any thing with a density higher than one sinks, and any thing with a density lower than one floats...

If you can't see how ice has a density lower than one, try looking at an ice cube as an example. You can see bubbles with in it, or white cracks filled with air.

Answer 2

An object will float if it weighs less than the water it displaces.  This means it isn't weight that matters, it's density.  A needle weighs very little, but it also displaces very little water... since its density is higher than that of water, it will sink.  An iceberg is huge, but also displaces a huge amount of water.  Since ice is less dense than liquid water (but not by much), it floats (but only barely--90% of an iceberg is underwater).