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.
View full size image. Step aside, Spider-Man: The world's strongest stuff isn't your silk; it's sea snail teeth. The teeth of the common limpet species (Patella vulgata) are tougher than Kevlar and stronger than spider silk, researchers report in the Feb. 18 issue of The Royal Society journal Interface.