Petrification is the process of turning plant material into stone. This is done by infiltration with water that carries mineral particles. The original shape of the item remains unchanged after the process.Know More
The petrification of wood is a common example of this process. In 1906, George Weber Wieland presented a theory proposing that wood petrification is based on five factors. Those factors include the tissue systems of the plant, temperature, minerals needed for silification or calcification, the duration of the chemical activity, and the nature of the embedding rock material.
The time it takes for petrification to occur varies depending on the minerals used. In general, the process takes a few hundred years to complete.Learn more about Geology
The most recognizable purple stone is the amethyst, a clear purple or bluish-violet variety of crystallized quartz commonly used in making jewelry or for decorative display. The name of the amethyst stone is tied to the Ancient Greek language and means "not intoxicated." This refers to the belief by some people that the amethyst protects the wearer from intoxication by alcohol.Full Answer >
"Seafloor spreading" is a process that produces basalt, a rock that makes up the ocean's crust. Seafloor spreading takes place at mid-ocean ridges. Two examples of such ridges are the Mid-Atlantic Rise and the East Pacific Rise.Full Answer >
Because platinum is so rare, it must be extracted after being mined through a process that involves crushing it into incredibly small particles and separating these particles from one another. This is known as the flotation separation method, and produces a frothy layer of particles that can be skimmed to provide the extracted platinum. This process is necessary because platinum, even in ore, needs to be removed from other substances.Full Answer >
Lithification is the process by which sediment turns into hardened rock. There are three ways in which lithification can occur. These processes are called compaction, recrystallization and cementation.Full Answer >