Troposphere :
Troposphere The troposphere is the lowest major atmospheric layer, and is located from the Earth's surface up to the bottom of the stratosphere.
The troposphere is where all of Earth's weather occurs.
Air in the troposphere also contains water vapor and small amounts of trace gases such as methane, nitrous oxide, carbon monoxide, hydrogen and ozone. These gases are in tiny amounts, but they are what makes the atmosphere an insulating blanket around the planet. Without this blanket, it would be too cold on earth to sustain life.
Stratosphere :
Stratosphere The stratosphere is the second major layer of Earth‘s atmosphere, just above the troposphere, and below the mesosphere.
It is stratified in temperature, with warmer layers higher up and cooler layers farther down. This is in contrast to the troposphere near the Earth's surface, which is cooler higher up and warmer farther down.
Mesosphere :
Mesosphere The mesosphere (from the Greek words mesos = middle and sphaira = ball) is the layer of the Earth's atmosphere that is directly above the stratosphere and directly below the thermosphere.
The mesosphere is located from about 50 km to 80-90 km altitude above the Earth's surface.
Thermosphere :
Thermosphere The thermosphere is the layer of the earth's atmosphere directly above the mesosphere and directly below the exosphere. Within this layer, ultraviolet radiation causes ionization.
The thermosphere, named from the Greek θερμός (thermos) for heat, begins about 90 km above the earth.
Thermosphere is the layer that covers the most space.
Exosphere :
Exosphere The exosphere is the uppermost layer of the atmosphere. In the exosphere, an upward travelling molecule can escape to space (if it is moving fast enough) or be pulled back to Earth by gravity (if it isn’t) with little probability of colliding with another molecule.
The exosphere is the highest layer of the atmosphere.
Together with the ionosphere, it makes up the thermosphere. The exosphere extends to 10,000 km above the Earth's surface.
Ozone Layer :
Ozone Layer If the ozone layer were brought down to the Earth's surface, air pressure and temperature conditions would compress the ozone into a layer 2 to 5 mm thick!
You have probably heard people talk about a "hole" in our ozone layer. Damage to our Earth's giant protective umbrella is more severe in the South Pole, but, even there, no actual "hole" exists. And only a slight thinning occurs over the rest of the world. So no matter where you stand, you won't find a true "hole".