New Real Estate Listings In St. Augustine. 1  $265,00057 Lewis Blvd2 Bed | 2 Bath | 118 SqFt. 2  $1,850,000655 S Holmes Blvd2 Bed | 1 Bath | 672 SqFt. 3  $349,00034 E Park Ave3 Bed | 2 Bath | 1613 SqFt. 4  $399,0001981 Glenfield Crossing Ct4 Bed | 3 Bath | 2956 SqFt. 5  $159,900220 Presidents Cup Way UNIT 2072 Bed | 2 Bath | 1055 SqFt.
The functional earth is used for interference suppression. It is a low-impedance current path between the circuitry and earth and is only used to improve the equipment's performance and not (!) for protective purposes.
Earth is considered a closed system because though heat enters, its mass remains essentially constant. The matter of Earth remains on Earth and in its atmosphere because gravity prevents it from migrating into space. Earth is also considered to be more of an approximation of a closed system because some matter does enter from space.