Some common mouth problems include. 1  Cold sores - painful sores on the lips and around the mouth, caused by a virus. 2  Canker sores - painful sores in the mouth, caused by bacteria or viruses. 3  Thrush - a yeast infection that causes white patches in your mouth.
-Explain why energy input is necessary to extract a metal from its ore In order to break the chemical bonds in the compounds, energy such as heat or electricity is required to break these bonds and extract the metal. -Identify why there are more metals available for people to use then there were 200 years ago.etal + Oxygen Metal Oxide Metals with a low reactivity such as gold and silver are used in jewellery because of their shiny lustre and the fact that they do not tarnish easily. with a particular emphasis on current developments in the use of metals. This is because the metal tends to want to keep its electrons more.
Iron fertilization is the intentional introduction of iron to the upper ocean to stimulate a phytoplankton bloom. This is intended to enhance biological productivity, which can benefit the marine food chain and is under investigation in hopes of increasing carbon dioxide removal from the atmosphere.Iron is a trace element necessary for photosynthesis in all plants.It is highly insoluble in sea water and is often the limiting nutrient for phytoplankton growth. Large algal blooms can be created by supplying iron to iron-deficient ocean waters.urrent estimates of the amount of iron required to restore all the lost plankton and sequester 3 gigatons /year of CO 2 range widely, from approximately 2 hundred thousand tons/year to over 4 million tons/year.