bamboo
On dry, thick gravel
The round hollow is known as an impact crater.
To become a hollow, another hollow must eat your soul. Once they have taken your soul, you become a hollow. :D
birds have hollow bones to help them fly
It's called a warren.
This may be known as grassland, savanna, or savanna grassland.
The thick mass of grass and soil is called the topsoil
you can get grass in all the Meadows and in fire fly light up
The thick grass is called sod. A farmer that was tilling such soil was called a sodbuster.
Bamboo, is considered a grass.
bamboo
It varies a lot, depending on the variety of grass, and the environmental conditions.
The grass is either wet or thick or a combination of the two.
reed, read
The brain is protected by the thick, hollow skull.
Length*width*heigth I don't get the hollow part. That all depends on whether the cube is closed, and how thick the squares are.