Deep in the ocean.
The Grand Canyon.
Agriculture.
they are in specific areas
normally damp weather with a lot of rain or snow depending where you are in the world
Diamonds are formed deep below the earth's crust, and come to us once the volcanic eruption forces the material to the surface. The vertical geology takes the form of a pipe -- a volcanic pipe. (Read link, below.) This phenomenon is unusual and uncommon in the world, thus lowering the numbers of places where diamonds can be found.
Mountainous areas can be found all over the world. There is no specific distribution pattern. Mountains can be created or formed through geologic activities such as weathering/ erosion, up liftment, plate tectonics and volcanic activity
Quails can be found in most areas of the world. They prefer to live in forest areas and woody habitats.
Cuttlefish can be found in in the parts of the world where there are reefs and shallow water areas. They will also be found in temperate and tropical seas.
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The blue fly, also known as the blue bottle fly or bottlebee, is common and can be found in most areas of the world.
Caves can be found all around the world, typically in areas with limestone, granite, or volcanic rock formations. They can be found in various environments, including mountains, deserts, and coastal regions. Some famous cave systems are located in places like Kentucky (USA), Mexico, Malaysia, and France.
Polonium exist in traces in uranium and thorium ores.
For a list of all the major desert areas of the world and the countries in which they are found, click on this link.
Whale Sharks are the largest fish in the world. They can be found in the tropic ocean areas.
Barred owls are found in temperate zones with wooded areas and lots of potential prey.
Australia/New Zealand and North and South America.
North America. Have been introduced with largemouth bass in other areas.