pencil and paper and eraser
No, a piece of string can be longer than 100 meters, depending on its material and how it is made. The length of string can vary based on the type of material used, such as nylon, cotton, or fishing line.
How tight the string is and how far it goesThe type of material used.
Surface mining is a method in which overlying rock material is stripped away to reveal mineral deposits. This type of mining is used when the mineral deposits are close to the surface, making it easier and more cost-effective to extract them. Examples of surface mining include open-pit mining and strip mining.
silk, yarn, or string. In the old times they used animal skins, or animal furs
String
Open-pit mining is a type of surface mining where large quantities of material are excavated from a large, open pit. It is commonly used to extract minerals such as copper, gold, and coal.
Yarn is the main material used for knitting. There is also wool or cotton knitting string that is more like string or cord than yarn but used for knitting. Or you may be looking for gymp, rexlace, or plastic lace used for a variety of craft projects.
Some surface mining methods include open-pit mining, strip mining, mountaintop removal mining, and placer mining. These methods involve removing the overlying material to access the desired mineral deposits near the surface. Surface mining is often used for coal, metals, and other minerals that are located close to the Earth's surface.
The mining and burning of coal is the most damaging to the environment.
horse hair
Surface mining is generally cheaper than underground mining because it involves removing material from the surface rather than having to dig deep underground. This makes it more accessible and requires less equipment and labor. Additionally, surface mining usually has higher production rates and allows for larger equipment to be used, further reducing costs per unit of material extracted.
Drilling is used in almost every type of mining to sample and determine the extent of a the deposit. Drilling is used for actual extraction of salt (by solution mining), petroleum, and natural gas.