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Which of the following would shift a nation's production possibilities frontier inward?
Permeable Sands
Sands that allow the passage of fluids through their pores or spaces, often used in filtering and drainage applications.
Granite
A common type of intrusive, felsic, igneous rock which is granular and phaneritic in texture, composed mainly of quartz and feldspar.
Gravity Signal
Represents the measurable effects of gravity on Earth's surface, which can indicate variations in Earth's density and structure.
Graph
A diagram representing data visually, typically showing the relationship between two or more variables with points, lines, bars, or slices.
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