_______ are valuable natural resource.
minerals
A _________ is a pure inorganic substances that occurs naturally in the earth's crust.
minerals
minerals are of two types ________ and __________
metallic and non-metallic
minerals from which metals can be profitable extracted are called ______.
ores
those minerals which contain metal are called ______.
metallic minerals
metallic minerals are called ______ if they have iron content and _________ in the absence of iron.
ferrous and non-ferrous
more than ______ minerals have been identified till yet
2000
industry depends on about _____ of them.
80
those which do not have metal content are called _______.
non-metallic minerals
_______ is the most useful mineral.
iron
______ is used as a major component in tools, machines, automobiles, ships and much more.
iron
iron is used to make ______ which is used in a wide range of applications.
steel
__________ is the most important industrial ore.
Magnetite
_________ is also an important industrial ore.
Hematite
Hematite content ______ iron.
70%
Magnetite content _______ iron
72%
