_______ are valuable natural resource.
vitamins
minerals
A _________ is a pure inorganic substances that occurs naturally in the earth's crust.
rock
mineral
minerals are of two types ________ and __________
squishy and non-squishy
metallic and non-metallic
minerals from which metals can be profitable extracted are called ______.
ores
luster
those minerals which contain metal are called ______.
non-metallic minerals
metallic minerals
more than ______ minerals have been identified till yet
20
2,000,000
2,000
industry depends on about _____ of them.
80
1800
those which do not have metal content are called _______.
metallic minerals
non-metallic minerals
_______ is the most useful mineral.
galena
iron
_________ is also an important industrial ore.
Topaz
Hematite
Hematite content ______ iron.
70%
20%
_______ is a soft brown metal found in igneous and metamorphic rocks.
copper
sulfur
copper is used in electrical,automobile and steel industry. TRUE OR FALSE.
TRUE
_____ has became so important in modern world.
quartz
tin
Pewter, an alloy is made by mixing tin with antimony, lead and bismuth. TRUE OR FALSE.
TRUE
_______ is very light,soft,malleable and durable.
Halite
Aluminium
