Animated Solution for Chemistry - Environmental Chemistry: The layer of atmosphere between 10 km to 50 km above the sea level is called as

Imagine you are standing on the surface of the Earth, looking up at the sky. It might seem like an endless, uniform expanse of air, but the reality is far more structured. The Earth's atmosphere is not just a single blanket; it is a highly organized system divided into distinct layers.

These layers are primarily defined by how temperature changes with altitude. As we travel upwards, the physical and chemical properties of the air shift dramatically, creating unique environments at different heights.

Where We Live

The journey begins right where we are standing. The lowest layer of the atmosphere is called the troposphere. This is the domain of life, weather, and clouds.

It extends from the Earth's surface up to approximately $10\text{ km}$ above sea level. Almost all of the water vapor and dust particles in the atmosphere are trapped here, which is why all our weather phenomena—rain, snow, storms—occur exclusively in this layer.

The Protective Shield

Moving higher, right above the troposphere, we enter a much calmer region known as the stratosphere. This layer stretches from $10\text{ km}$ all the way up to $50\text{ km}$ above sea level.

Unlike the turbulent troposphere below, the stratosphere is relatively stable and free of weather. This stability is exactly why commercial airplanes prefer to cruise in the lower stratosphere—it provides a smoother ride and better fuel efficiency.

More importantly, the stratosphere is home to the ozone layer. This crucial concentration of ozone ($O_3$) molecules acts as Earth's sunscreen, absorbing the majority of the Sun's harmful ultraviolet (UV) radiation and protecting life below.

If we were to continue our journey past $50\text{ km}$, we would enter the mesosphere, which extends up to about $85\text{ km}$. This is the coldest layer of the atmosphere and is famous for being the region where meteors burn up upon entry, creating the beautiful shooting stars we occasionally see at night.

Beyond the mesosphere lies the thermosphere, a region of extremely high temperatures where the air is incredibly thin, and where many of our artificial satellites orbit the Earth.

Returning to our original question, we were asked to identify the layer of the atmosphere located between $10\text{ km}$ and $50\text{ km}$ above sea level.

Based on our vertical journey, it is clear that this specific altitude range belongs to the stratosphere. Therefore, the correct answer is option (a). Visualizing these layers not only helps in answering such factual questions but also deepens our appreciation for the complex, protective bubble that sustains life on Earth.