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 strongest natural material ever known has been found... in the teeth of a tiny shellfish. Scientists, who made the discovery while examining limpets, say the substance could revolutionise industrial engineering. Researchers at the University of Portsmouth believe it is even stronger than the silk spiders use to make webs, until now thought weight for weight to be the worldâs toughest biological material.