The oil in the Athabasca Tar Sands of Alberta, Canada, has not been exploited commercially to any great extent, primarily because it is
prohibitively expensive to separate the oil from the surrounding sand.
A because it is
B because of being
C being that it is
D on account of its
E on account of being
"Start By Doing What Is Necessary ,Then What Is Possible & Suddenly You Will Realise That You Are Doing The Impossible"