Some erasers have rubber(natural or synthetic). The rubber is made from rubber trees. It also contains styrene, buadience, sulpher, vynil, colorants( to get it the color you want like green for example), pumice, and vegetable oil.
petroleum
Tires are a man made product made from natural resources. Early tires used natural resources from rubber trees, cotton plants, and sulfur. The cotton was spun into fibers that were used embedded in uncured natural rubber to strengthen it and the tire was cured using the sulfur in a process called vulcanization. Modern tires use natural resources from petroleum, iron ore, etc. The iron ore is made into steel which is made into steel fibers that are embedded in uncured synthetic rubber made from petroleum to strengthen it and the tire is cured.
Things that use rubber (and also synthetic rubber) include: tires, erasers, rubber bands, seals, gaskets, rollers, machine belts, cushioning pads, electrical insulation, bouncing balls, sports balls, and tool grips.
umm it is used for tires and gum
Natural rubber, or gum rubber, is made from latex. A LOT of rubber available today is synthetic, made from petroleum. And a large amount of the gum rubber contains a percentage of synthetic rubber.
petroleum
Rubber bands, tires, erasers.
it is the tires
Tires are a man made product made from natural resources. Early tires used natural resources from rubber trees, cotton plants, and sulfur. The cotton was spun into fibers that were used embedded in uncured natural rubber to strengthen it and the tire was cured using the sulfur in a process called vulcanization. Modern tires use natural resources from petroleum, iron ore, etc. The iron ore is made into steel which is made into steel fibers that are embedded in uncured synthetic rubber made from petroleum to strengthen it and the tire is cured.
Your best resource for cheap tire is craigslist.com. You can save on shipping and handling by purchasing tires in your area. You can also get tires used.
nonrenewable
I have found that Michelin and Bridgestone tires are the most expensive of the tires that they sell at my local dealership.
Most tires made today use a combination of natural rubber and synthetic rubber to achieve the maximum tread life and safety rating.
From the research that I have done I have found that the Mastercraft brand of tires is a good tire brand. I have found that they sell a very wide range and selection of tires to suit your needs.
I have found that Sam's Club and Costco have the lowest prices on new tires. They also will replace the tires for you right at both stores. I have found them to be very quick as well.
There is no such thing as a natural rubber, rubber is man made.
A review of general tires can be found on many different sites. These different sites include review sites such as ConsumerReports and TheTruthAboutCars.