Activity:

Cross word puzzle: solve it with the help of the clues given below.

Across:

1. An ore of Aluminium (7)

3. A type of iron ore (9)

5. Mineral extracted by placer or alluvial method (4)

7. A non metallic mineral (6)

Down:

1. Mining closer to the surface (9)

2. Removing long strips overlying rock and soil (11).

4. Mining at greater depths (11)

6. Tower like features at the oil fields (8)