Fig. 76.
Are the alternations of the earthy and coal strata satisfactorily explained?
In what portions of the geological series are the deposits of salt found?
Where is saline matter principally stored?
Explain the conjectural formation of salt in the Mediterranean Sea.
What form do rocks take when deposited from a chemical solution?
How is sand or gravel solidified by the infiltration of mineral waters?
What is the effect of drying upon the solidification of rocks?
What is the effect of pressure?