Why is it cooler on top of a mountain?
This is a reasonable doubt indeed, because when we climb up a mountain, though we are going towards the sun, it is still cooler up there on top.
Why is it so?
The air is always warmest near the Earth's surface.
This is because the sun heats the Earth, and the gives off heat that warms the air.
The sun does not warm the atmosphere directly.
For each 300 meters, the temperature drops by about two degree centigrade.
What is cached data in Mobile phones ?
The main reason why cached data exists is to make loading time faster.
So if the device already has the layout of the website saved in the form of cached data, it will not have to load that same data once again.
This helps in quickening the process of loading the website.