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1. 
Diamonds are ......
A.
rocks
B.
minerals
2. 
b. There are over 4 000 types of ..... in the world.
A.
rocks
B.
minerals
3. 
..... are clusters of ..... and other inorganic materials.
A.
rocks / minerals
B.
minerals / rocks
C.
rocks / rocks
D.
minerals / minerals
4. 
.... are structured crystals that have specific chemical components.
A.
Rocks
B.
Minerals
5. 
There are three main types of ....: igneous, sedimentary and metamorphic.
A.
rocks
B.
minerals
6. 
Elements, sulphates and oxides are types of ....... .
A.
rocks
B.
minerals