Is pin a common noun

Granite is made up of the minerals feldspar and mica? How many color are in the rainbow? What are Fossils most ofen preserved in? Which one of these is the shortest length 0.060 kilometers0.600 meters6000 centimeters60 millimeters? Why did Thaddeus Lowe invent the ice machine? Explain fossil fuels and how they are used? Why is it important to only have one variable in an experiment? What is better cold or hot butter for crumb topping? Is a sports cooler 4 liters or 40 liters? Why are observations skills important to forensics? If you weigh 120 pounds on earth how much would you weigh on Pluto? In an elevator when is your apparent weight less than your real weight? How do you measure a nail? What the use of clean up? What does fimbriae do? How many kJ are in a MJ? Chewing is an example of? How many miles in 2.9 million meters? Can i connect my Macintosh to my wi-fi internet with a wi-fi dongle? How can you use a simple machine to make a job easier?