Add Image. Exotic Materials are the strange and unusual elements produced by science, nature, or some strange alien force. Such materials could be alloys, isotopes, chemicals, and such.
Hotels and hostels both provide accommodations to travelers, but while the two provide a dry place to stay, the similarities end there. In most cases, hotels are the more luxurious of the two and, therefore, more expensive. At a hotel, a traveler can have his own room and bathroom as well as maid service and other amenities.
Difference Between Cave and Cavern. Cave and cavern are often used interchangeably but in reality, they do not mean the same thing. A cavern is a special type of cave. A cave is defined as a hollow in the earth that has an opening into a hill or a mountain. The opening of a cave can be either horizontal or vertical.