______________is a carbonite ore of copper.

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

A strong smelling compound used in LPG is called___________.

___________soil contains clay, silt, sand and humus in the right proportion.

____________is used in the manufacture of cement.

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

__________is the only rock that is used as a fuel.

_____________is the outermost layer of earth.

____________mineral contains silicon and oxygen.

The layer below the crust is called