Which of the following contains significant amounts of aluminum oxide (three correct answers): a. alumina b. corundum c. feldspar d. sandstone e. silica f. kaolinite g. quartz h. bauxite

a. alumina

b. corundum

h. bauxite

Explanation:

The following compounds have the maximum amount of Aluminum oxide -

Alumina -

Alumina is known as the aluminium oxide , with a formula of ,

It is the most commonly occuring oxide of Aluminum metal .

Corundum -

It is the crystalline form , with the molecular formula of ,

It also have some trace of other metals like , chromium , vanadium , titanium.

bauxite -

It is the sedimentary rock , which has very high quantity of Aluminium metal .

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.