On the top because that is where the ice is
Bottom.
It is colder at the top of a refrigerator because cold air sinks, causing the lower portion to be slightly warmer.
Ice is 9% less dense than water so it floats. When water freezes it floats to the top so the water (liquid) is always at the bottom.
circulates from the bottom to the top
No, a buret is read from bottom to top to accurately measure the volume of liquid dispensed.
You read a meniscus from the bottom to the top by looking at the lowest point of the curved surface of a liquid in a container. This is where the measurement is taken for volume.
Temperatures decrease with altitude due to a decrease in air pressure as you go higher. This causes the air to expand and cool down, hence making it colder at the top of a mountain compared to the base.
At the bottom, there is the additional weight of the gas or liquid above the surface level.
In general, liquids tend to have higher densities at the bottom of a container and lower densities at the top. This is because of the effect of gravity causing denser liquid to sink to the bottom and less dense liquid to rise to the top.
The stratosphere being colder at the bottom than at the top creates a temperature inversion, where warm air traps cooler air below it. This stability inhibits vertical air movement and can affect weather patterns, air quality, and the spread of pollutants in the atmosphere.
It can. One area may be warmer than the other which would reduce shelf life. Usually, the bottom of the fridge is colder than the top, but it is a good idea to check that with a calibrated thermometer.
This is found out by knowing the densities of the liquids in question. The liquid with the smaller density will always be on top, while the liquid with the higher density will be at the bottom.