The rubber tree is grown
because rubber is made from the latex in its bark.
The rubber tree has roots made up of
and creeping roots.
In the bark of the rubber tree
there is a liquid called latex.
The latex is harvested
by making a slit in the bark,
that is, by cutting a piece of bark.
The latex makes the rubber that is used:
Rubber is in great demand all over the world;
more and more of it is needed.
But it is very difficult
to grow rubber trees well
and to harvest the latex.
They cannot be grown everywhere.