Final answer:
In a gun's barrel, lands refer to raised areas, while grooves are indentations that aid in gripping the projectile for stability and accuracy.
Explanation:
Land in a gun's barrel refers to the raised areas between the grooves. Lands make contact with the projectile, imparting spin for accuracy. Grooves are the cut-in areas that help in gripping the projectile.
By looking down a gun's barrel, lands appear as raised areas while grooves appear as indentations. Lands and grooves work together in rifled barrels to spin the projectile for stability and accuracy.
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