Radon-222 (Rn-222) is a radioactive isotope of radon, a noble gas that occurs naturally in the environment as a decay product of uranium and thorium. It is colorless, odorless, and tasteless, making it undetectable without specialized equipment. Radon-222 has a half-life of about 3.8 days, meaning that it decays relatively quickly compared to some other radioactive isotopes.

Bowie Canyon generally refers to a geographic location that may be known for specific natural features, hiking trails, or recreational activities. Canyon locations often attract outdoor enthusiasts for activities like hiking, camping, and photography due to their scenic views and geological formations. However, without more specific context, it may refer to different locations or places.

Byrd Canyon is a geographical feature located in the Santa Monica Mountains in California, USA. It is known for its natural beauty, hiking trails, and panoramic views of the surrounding areas. The canyon is part of the larger Santa Monica Mountains National Recreation Area, which offers outdoor activities such as hiking, biking, and wildlife viewing. The canyon has been shaped by various geological processes and is characterized by steep cliffs, lush vegetation, and various rock formations.

The term "Cooperation Sea" does not refer to a widely recognized concept, geographic location, or organization as of my last knowledge update in October 2023. It is possible that it could pertain to a specific project, initiative, or term that has emerged more recently or is specific to a certain context.

Fedhala Roads does not appear to be a widely recognized term or concept in common knowledge or major fields of study up to October 2023. It might refer to a specific location, road network, or area that is not well-documented in mainstream sources.

The Great Bahama Canyon is a significant underwater canyon located in the western part of the Atlantic Ocean, near the Bahamas. It is one of the largest underwater canyons in the world and is formed by the erosion of the ocean floor over millions of years. The canyon reaches depths of over 8,000 meters (approximately 26,000 feet) and extends for several hundred kilometers.

Havre Seamount is an underwater volcano located in the Kermadec Arc, which is part of the larger Pacific Ring of Fire. It lies northwest of New Zealand and is situated about 1,500 meters (approximately 4,900 feet) beneath the surface of the Tasman Sea. The seamount is notable for its significant geological activity, including volcanic eruptions. In 2012, Havre Seamount experienced a major eruption that was detected by researchers using underwater surveying techniques.

Isla Verde Reef is a coral reef located off the coast of Isla Verde, a popular tourist area in Puerto Rico. The reef is known for its diverse marine life, making it a popular spot for snorkeling, diving, and other water sports. The area features a variety of coral species, fish, and other marine organisms, which contribute to its ecological significance and attractiveness for visitors.

Jingū Seamount is an underwater volcanic feature located in the Pacific Ocean, specifically in the Kuroshio Current region, southeast of Japan. It is part of the Japan Arc, which is associated with the subduction of the Philippine Sea Plate beneath the Eurasian Plate. The seamount is notable for its elevation from the ocean floor, rising to a depth of around 1,000 meters below sea level.

Perth Canyon is a significant underwater canyon located off the southwestern coast of Australia, near the city of Perth in Western Australia. The canyon stretches approximately 120 kilometers (about 75 miles) along the ocean floor and is one of the largest underwater canyons in the world. The canyon features steep-sided walls and a complex structure that includes a variety of geological formations. It is believed to have formed through the processes of erosion and sedimentation over millions of years.

Malacca Banks, also known as the Malacca Shoals or Malacca Bank, refers to a series of underwater banks and shallow areas located in the Strait of Malacca, which is the narrow stretch of water that separates the Malay Peninsula from the Indonesian island of Sumatra.

Mawson Bank is a proposed underwater habitat and research station located in the Southern Ocean, near the Antarctic continent. It is part of efforts to explore and understand the unique ecosystems of the region, particularly in the area of marine biology and climate change. The project aims to provide a platform for scientific research, habitat preservation, and potentially even tourism in a sustainable manner.

The Nansen Basin is a deep oceanic basin located in the Arctic Ocean, specifically in the central part of the Arctic. It is named after the Norwegian explorer Fridtjof Nansen, who contributed significantly to Arctic research in the late 19th and early 20th centuries. The Nansen Basin is characterized by its bathymetry, which includes deep trenches and relatively flat seafloor regions. It is surrounded by various underwater features, including ridges and continental shelves.

The North Korea Cold Current, also known as the East Korea Current, is an oceanic current that flows along the eastern coast of North Korea into the Sea of Japan (also known as the East Sea in Korea). It is part of the larger North Pacific Ocean currents system. This cold current originates from the Northwest Pacific and is characterized by its relatively low temperatures compared to surrounding waters. It generally flows southward and can influence local marine ecosystems, weather patterns, and climate conditions in the region.

Orphan Knoll is a submerged bank located in the Atlantic Ocean, specifically within the Hudson Canyon, which is off the coast of New Jersey. It is part of the continental shelf and is known for its unique underwater topography and marine ecosystems. Orphan Knoll is recognized for its rich biodiversity and is often studied for its ecological significance. The knoll is characterized by its elevation relative to the surrounding seabed, making it an important habitat for various marine species, including fish and invertebrates.

Porcupine Bank is an underwater bank, or elevated seabed, located off the southwest coast of Ireland in the Atlantic Ocean. It is characterized by its relatively shallow waters compared to the surrounding deeper seabed. The bank is situated between the Porcupine Abyssal Plain to the south and the continental shelf of Ireland to the north. The Porcupine Bank is of interest for several reasons, including its unique marine ecosystems, geological features, and potential resources.

Rosemary Bank is an underwater feature located in the South Atlantic Ocean, specifically near the South Georgia and South Sandwich Islands. It is classified as a seamount, which is an underwater mountain formed by volcanic activity. The seamount rises from the ocean floor and can serve as important habitats for marine life, as well as areas of scientific interest due to their unique ecosystems. Rosemary Bank is known for supporting diverse biological communities, including various fish species and other marine organisms.

Scatarie Bank is a small, underwater bank located off the coast of Nova Scotia, Canada. It is situated near Scatarie Island, in the Atlantic Ocean. The bank is characterized by its shallow waters and rocky seabed, which can be significant for marine navigation and ecology. In a broader context, "bank" refers to a submerged elevation, which can affect ocean currents and serve as a habitat for various marine species.

Scripps Canyon is a geographic feature located in La Jolla, California, near the Scripps Institution of Oceanography. The canyon is part of the coastal landscape and is known for its deep marine environment and unique geological formations. It typically features steep cliffs and a variety of marine habitats, making it a notable site for both scientific research and recreational activities such as hiking, snorkeling, and diving.

Shirshov Ridge is a submerged mountain range located in the Pacific Ocean, east of the Kuril Islands and southeast of the Kamchatka Peninsula in Russia. It is part of the North Pacific Ocean's geological features and is primarily known for its volcanic activity and unique underwater topography. The ridge is named after the Soviet geologist and oceanographer Aleksandr Shirshov, who contributed significantly to the study of the seafloor and oceanography in the region.