Question

Why does ice stay at the top of oceans instead of sinking to the bottom?. . Ice is colder than liquid water.. . Ice is warmer than liquid water.. . Ice is more dense than liquid water.. . Ice is less dense than liquid water.

Answer 1

Ice is less dense than liquid water. This is the reason why the cubes
float in your soda, and bergs float in the ocean.

Water is one of a very very few substances that have this peculiar behavior.
If it didn't, then the oceans would freeze from the bottom up, and life could
not exist on Earth.