Characteristics of Isotonic and Hypertonic. 1  Concentration of solute and solution. 2  Examples. 3  Cells response in hypertonic and isotonic solution (See figure 1) 4  Water concentration gradient. 5  Solute concentration gradient. 6  Osmotic shift. 7  Movement of water. 8  Sports drinks.
However in my opinion some of the hardest and strongest rocks in the world are the quartzites found in the Witwatersrand in South Africa, Quartzite is a sandstone which has metamorphosed-that is it has been subject to high pressures and temperatures which have modified its structure.
The record on Earth is held by a stone found by a mining company in August 2007 in a North West province of South Africa. Before that, the Cullinan, which was found near Pretoria in 1905, was the largest cut diamond in the world at 530.20 carats, until it lost the record in 1985 to the Golden Jubilee.