Worth 20 our planet has frozen poles. what property does frozen water have that might be useful in searching for other planets with frozen poles?

Ice and snow are reflective, so a planet that has ice and snow will be more visible

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the wetland preservation movement began in the u.s. in earnest with the clean water act (cwa) of 1972. although not specifically written to protect wetlands, the cwa is comprised of a series of regulations designed to prevent pollutants from contaminating u.s. waters.