Hornfels is a fine-grained nonfoliated metamorphic rock with no specific composition. It is produced by contact metamorphism. Hornfels is a rock that was baked while near a heat source such as a magma chamber, sill or dike. The specimen shown above is about two inches (five centimeters) across.
Industrial Hemp Facts. Industrial hemp is a variety of Cannabis sativa and is of the same plant species as marijuana. However, hemp is genetically different and distinguished by its use and chemical makeup. Industrial hemp refers to cannabis varieties that are primarily grown as an agricultural crop.
In this way, hemp is a very similar crop to bamboo. The stalk contains the fiber and hard, woody core material that can be used for a variety of purposes, even carpentry. Generally, THC-producing marijuana plants are grown to an average of five feet in height. Industrial hemp on the other hand is grown to a height of ten to fifteen feet before harvest. Also, it is fairly difficult to grow concealed marijuana within industrial hemp crops as the DEA alleges.