Concept:The gaseous layer surrounding the Earth's crust is known as the atmosphere.
Explanation:The Earth's outer solid layer is called the crust.
The envelope of gases that surrounds this crust is the atmosphere.
It contains mainly nitrogen and oxygen, along with traces of other gases.
This gaseous layer is vital for life and for weather processes.
Now, consider the other options.
The hydrosphere refers to all the water on Earth.
The lithosphere is the solid outer shell, including the crust.
The barysphere is the dense interior zone of the Earth.
Thus, none of them describes the gaseous envelope.
So, the correct term for the gaseous envelope around the Earth's crust is the atmosphere.
Answer:C. atmosphere