The resources which cannot be used any number of times because they are limited in quantity are called _____________.
(a) What is meant by inexhaustible natural resources ? Name two inexhaustible natural resources.
(b) What is meant by exhaustible natural resources ? Name any two exhaustible natural resources.
Disposable plastic plates should not be used because
(a) they are made of lightweight materials.
(b) they are made of toxic materials.
(c) they are made of biodegradable materials.
(d) they are made of non-biodegradable materials.