In the exclusive economic zone, the coastal State shall have the exclusive right to construct and to authorize and regulate the construction, operation and use of: (a) artificial islands; (b) installations and structures for the purposes provided for in article 56 and other economic purposes;
Infrasound may also be used for long-distance communication in African elephants. These calls range from 15â35 Hz and can be as loud as 117 dB, allowing communication for many kilometres, with a possible maximum range of around 10 km (6 mi).
It may be used when a product is unique to the marketplace, which can make consumers leery of trying it out. This technique is commonly used in television infomercials where the buyer has 30 days to try the product, during which time he can return it for a full refund if he's not satisfied.