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You observe the following three galaxies and measure their respective recession velocities: A, 2,100 km/s; B, 4,400 km/s; and C, 3,050 km/s.Which of the following must be true about these galaxies?
Permeable Rocks
Rocks that allow water to pass through them due to their porous nature.
Impermeable Rocks
Geological formations that do not allow fluids, like water or oil, to pass through them due to their tight structure.
Tidal Barrier
A structure built at the mouth of a river or in a tidal area, aimed at protecting low-lying areas from flooding due to high tides or storm surges.
Hydroelectric Power
Energy produced from the movement of water, often by using dams to generate electricity from water flowing downhill.
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