The earth's crust is mainly composed of ?

The elements in the earth's crust,which, are rarely found exclusively but are usually combined with other elements to make various substances. These substances are called as ?

Which rocks are solidifies from Magma and Lava ?

The element present in largest amount in rocks and minerals is 

A continuous process through which old rocks are transformed into new ones is called?

Which of the following is the Salient feature of metamorphic rocks ?

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

Sedimentary rocks are classified into how many groups ?

Which mineral is used in jewellery ?

Which one of the following is organically formed ?