5 d A porous rock consisting of calcium carbonate that is used for building(10).
20a 1st Viscount ..the title of the newspaper and publishing magnate Alfred Harmsworth 11)
21d. Mary ..Scottish scientist after whom a University of Oxford college is named.
26d.in anatomy,an almond-shaped part,such as a tonsil or a lobe of the cerebellum (8)
33d -Castle,a Tudor mansion in Kent home of Anne Boleyn before her marriage (5)