What are atmospheric boundaries?

Atmospheric boundaries are like invisible walls that separate different layers of air around Earth.

Imagine you're playing with a toy box, it has different sections: one for blocks, one for cars, and one for dolls. Each section is separated by walls. Now think of the air around us as being in different sections too, but instead of walls, there are invisible lines that show where each layer starts and ends.

The atmosphere has several layers, like steps on a staircase. The first step is the troposphere, this is where we live, and where planes fly. Above that is the stratosphere, then the mesosphere, thermosphere, and finally the exosphere. Each layer feels different: some are warmer, some colder, and they each have their own kind of air.

These invisible lines between layers are called atmospheric boundaries. They're not magic, just like how you know when you've moved from one section of your toy box to another. You can feel the change in temperature or pressure, like when you go from a warm room to the cold outside.