Question

ice floats on water whereas a needle sinks explain

Answer 1

ice density is lesser than water
needle density is higher than watef

Answer 2

A needle sinks in water whereas an ice doesn't. This is because of their densities. Needle has higher density than water therefore it sinks while ice has less density than water therefore it floats.

Density of needle (made of steel): 8050 Kg/m³
Density of water: 1000 Kg/m³
Density of ice: 917 Kg/m³
 
Hope it helps.....