What is the sphere that forms a thin layer of gases around the earth?

The sphere that forms a thin layer of gases around the Earth is called the atmosphere. It is composed primarily of nitrogen, oxygen, and trace gases, and it plays a crucial role in supporting life by providing the air we breathe, regulating temperature, and protecting the planet from harmful solar radiation. The atmosphere is divided into several layers, including the troposphere, stratosphere, mesosphere, thermosphere, and exosphere, each with distinct characteristics.