Parts of the teeth include: 1  Enamel: The hardest, white outer part of the tooth. Enamel is mostly made of calcium phosphate, a rock-hard mineral. 2  Dentine: A layer underlying the enamel. Dentine is made of living cells, which secrete a hard mineral substance.  Pulp: The softer, living inner structure of teeth.
Though they vary significantly, transportation costs accounted for 40% of the average overall cost of coal delivered at electric power plants in 2010. On average, nominal U.S. rail rates for shipping coal grew from $11.83 to $17.25 per short ton from 2001 to 2010.
Regardless of how much money you may make, costs are always important. There are so many different factors to identifying how much your trip will cost, that it can be hard to get a good price estimate. For economical travelers, a bike ride across America can cost somewhere between $1531 and $2785.This total incorporates every cost that you will need to bear, starting from square one.The only thing which is excluded is the transit cost needed to get you to your starting point and back home from your ending point.dding all of the subtotals together, all of your gear will cost you about $167 to $374 to buy if starting from square one. On the Road Costs ($1314-$1911). Once you actually start the trip, you will obviously have to pay for the day-to-day expenses of food, accommodations, and bike maintenance.