Hollow spaces in the Earth's crust are commonly referred to as cavities or voids. These can occur naturally, such as in the form of caves or caverns created by erosion, or they can be the result of human activities, like mining. Additionally, some hollow spaces may be classified as sinkholes when they form due to the collapse of underground material.
Botches
Botches
Canyo
what what
Lava....when its under the earths crust its called magma.
fulat
It is called the crust.
It is the volcano.
what what
continental crust
Yes
The crust.