Explain the discovery of glacial grooves in Africa is surprising because Africa is now warm. How does the hypothesis of continental drift help to explain these glacial
features?

The answer would be

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Sorry im just trying to get answers like you are 

Asolution is a mixture of 2 or more substances which are called a solute and a solvent