Which is impure aluminum?

What feature on the earth's crust gives us an occasional view of how earth looks inside? How cell to cell movement of water takes place in plants? What are earths climate patterns are due to? Number of DNA molecules in a chromosomes? What happens to halite rock fargements when stirred in water? Why is burning wood a exothermic reaction? Stature disorder in which the body produces either too much or too little growth hormone is a disorder of which endocrine gland? Why is salt not flammable? Why is a virus's reproduction cycle called the lytic cycle? How many provinces of Canada are completeley or partially included between 50 degrees North and 60 degrees North latitude? What happens when a substance reaches its saturation point? What is the position of an image under a microscope? Why crab legs fall off? What happens to the atoms in a metal when it is stretched? What are the two elements in magnesium oxide? What would the vacuole be in a factory? How does temperature of the planet mars vary with the distance from the sun? Why is a treatment that utilizes high-frequency sound waves to treat muscle injuries? What do you do with a hive after you kill the bees? Describe the pressure and distance relationship between two pressure systems that would cause the strongest winds?