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Discover Ludwig"square kilometer" is correct and usable in written English.
It is a metric term used to measure area. For example, "The area of the park was 12 square kilometers."
Dictionary
square kilometer
noun
Standard spelling of square kilometre
Exact(56)
Those spots, or pixels, represent about a square kilometer.
It's not as if America is overcrowded: The United States has 35.6 people per square kilometer, compared to 272 people per square kilometer in the United Kingdom.
Flora is highly diverse: one square kilometer may contain as many as 100 different tree species.
Absolute density of the species in the study area was 0.65 individuals per square kilometer.
The average concentration of samples would roughly equal 20,300 pieces per square kilometer.
Flora is characterized by 3-4 tree species per square kilometer.
That's 1,200 people per square kilometer (about four-tenths of a square mile).
Similar(4)
The 640,000-square-kilometer MPA contains numerous threatened and endangered species, including sharks and turtles.
The silver lies in a 5-square-kilometer patch of land in the Bolivian Andes.
So the researchers played a 30-square-kilometer game of connect the dots.
Some, such as the Baltic Sea's 80,000-square-kilometer zone, even persist year-round.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com