It is in the pores or small spaces in the wood.
Is there air in the earth?
Yes; there is air among the particles of the earth.
How deep in the earth does the air extend?
We cannot tell; but both air and water have been found several hundred feet below the earth’s surface.
Of what use is the air in the earth?
It is breathed by the worms and other creatures that live in the earth.
When part of the air is taken from a room, what becomes of the air left in the room?
It expands so as to fill the whole room.
Are the particles of air so close together after it expands as they were before?