How hard is concrete on mohs scale?

How many mm are in 6.5 inches? What is oxygen needed for in the amoeba? Distinguish among the three domains of life? When did Jane Goodall finish high school? What is absorbed by water in Earth's atmosphere and requires that telescopes forobserving at these wavelengths be placed on mountain tops or in space? If you put a North Pole magnet at The Magnetic North Pole will it levitate? How does the 5 factors affect the British climate? What is the birth name of Angie Stone? Where can someone find more information about the Dell Latitude C400? What do you call the summer sleep of desert snails and other creatures in excessively warm or dry climates? What is the term for a mixture with fine insoluble particles in it that eventually settle out to form a sediment? A graduated cylinder is filled with water to a level of 40.0ml when a piece of copper is lowered into cylinder the water lever rises y to 63.4ml.find the volume of copper sample.I'd the density mass? Why are group 1 and 7 elements are found as compounds? What is liquid fraction? What arguments are there against stopping global warming? How can the command centre communicate with the space ship in space if outer space is a vacuum? What is the name of a person who directs an archestra? What is the chemical that provides detailed instructions to the cell about every function of life? Are atoms changed in chemical reactions according to Dalton's Atomic Theory? What Metallic substance formed by combining two or more metals?