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Cape Verde
The Canary Islands which are situated in the Atlantic off the western coast of southern Morocco.
Indonesia consists of over 13,000 islands, making it the country with the most islands in the world.
One example of an archipelago is the Hawaiian Islands, which consist of a chain of volcanic islands in the central Pacific Ocean.
japan
The country made up of a group of islands in the Atlantic Ocean west of Mauritania is Cape Verde.
Tristan da Cunha is a group of small volcanic islands in the South Atlantic Ocean.The South Atlantic OceanThe South Atlantic Ocean
The Madeira Islands are an autonomous region of Portugal located in the Atlantic Ocean.
Japan
There are currently no active volcanoes in the Atlantic Ocean. The last known eruption in the Atlantic occurred in 2011 at El Hierro, one of the Canary Islands. Other volcanic islands in the Atlantic, like Iceland and the Azores, have experienced historical eruptions but are not currently active.
If it is a single island, it is simply known as a volcanic island! If however it is a chain or string of separate islands then it may be a volcanic island arc (these form parallel to trenches at subduction zones) or a volcanic island chain (these form where a mantle plume creates a hotspot and may be in the centre of a tectonic plate. A good example would be the Hawaiian island chain). They can also form a cluster of islands (an archipelago) such as the Canary Islands (again formed by hotspot volcanism) in the Atlantic of the coast of Morocco.
Along the Mid-Atlantic Ridge, tectonic plates are moving apart, causing volcanic activity and the formation of new oceanic crust through seafloor spreading. This also leads to the release of magma, creating volcanic islands and hydrothermal vents.