Which one of the following is organically formed ?

Aluminium, Calcium, Silica, Iron, Magnesium are the major elements of ?

Which of the following is a mixture of non-metallic minerals ?

Half of the earth's crust is composed of __________ .

The element present in largest amount in rocks and minerals is 

Which is the most abundant element in the earth crust ?

Which of the following is the most important component of sand and granite ?

Which on of the following is a Sedimentary rock ?

Which mineral is used in jewellery ?

The mineral that constitues 4% of the earth's crust is?