Answer:
Glacier Landforms: Trough. Glacial troughs, or glaciated valleys, are long, U-shaped valleys that were carved out by glaciers that have since receded or disappeared. Troughs tend to have flat valley floors and steep, straight sides. Fjords, such as those in Norway, are coastal troughs carved out by glaciers.
Or: Steep U shaped valleys that connect with the sea and fill with water when the glaciers melt. Now keep scrolling;)
Explanation:
The magma that rises out of them cools eventually, with some help from the water. eventually all the cooled magma builds up into an island.
Answer: Its not rare and this isn't a question so stop deleting my answer.
Urban Sprawl is pretty much the migration of a population from a populated city or town to rural land
Smaller scale has less variables and correlations to be based on while a larger scale has a bigger amount of mathematical numbers to be based on