The average radius of the core is about _________.

__________ has a radius of about 3500 km.

____________ is about 3000 km thick.

The top most layer of the crust is called _____________.

The uppermost layer of our earth is known as ___________.

___________ has an average thickness of about 60 km.

The mineral matter results from the ___________ of rocks.

The word 'igneous' has been derived from

____________ rocks are formed by cooling and solidification of molten matter on the surface of the Earth or within the crust.

_________ refers to the soil or the crust of the Earth.