The cracks which extend from bark towards the sap wood in the cross section of a tree, are called

Gniess is obtained from

Refractory bricks are used for

The curved swellings from the growth of layers or wounds left after branches are cut off in an irregular manner, are kno…

The property by virtue of which lime sets under water, is known as

Durability of building stone is affected by its

Cast iron

Shingle is

Which one of the following is acid resistant asbestos: