What is the necessity of introducing group 8 in periodic table?

How does the magnetism in the compass work with the magnetism of earth so that the compass is a useful tool for navigating? What are ring stands used for? What is a mineral used in ceramics? Give example of the types of problems chemists are trying to address within each area of research? What is purification of blood? Where can you find a labeled diagram of an Orca whale's internal organs? What are the most effective alternative energy sources for homes? Where do Surface waves get their energy from? If Earth's interior was the same composition as the crust what would happen? When alum is added to water sticky globs form or? Can you explain the controversy about Pluto? How much mercaptan is in natural gas? What do cloroplast and mitocondria have that other organelles lack? Where does photosynthesis take place in flower? What is tricare group number? How many 3d electron are in potassium? What is mydinoscom? What is the word for bending a joint? What is the area of the sun that can extend outward a distance equal to 10 to 12 times the diameter of the sun? How many meters are in one meter square?