__________is an oxide ore of aluminium.

___________are classified into igneous, sedimentary and metamorphic rocks.

___________soil has high water retaining capacity.

______________is formed from sandstone.

__________soil contains a large amount of sand particles and very small amounts of silt and clay.

The metals such as aluminium, Iron, calcium, sodium, potassium and magnesium are present in the

_________is used for manufacturing glass.

__________is the only rock that is used as a fuel.

____________is used in the manufacture of cement.

__________is blue due to the presence of small amount of cobalt or titaniunm oxide.