Which of the following statements about geothermal energy is not true? a. it is not a practical source of energy. b. it is an important source of energy in volcanically active areas. c. it works best when the magma pool is near the surface of earth. d. it is a renewable source of energy. select the best answer from the choices provided a b c d

a. It is not a practical source of energy

Explanation:

Geothermal energy is obtained from hot springs. This energy is harnessed from the hot water from the geosphere. The groundwater gets heated due to hot mantle below the deeper layers of the earth. The geothermal hot water is used to heat buildings, it is used in greenhouses as a source of thermal energy, heating water at farms of fishes, also use for pasteurization of milk and for other industrial procedures.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

b. a lightning bug, plug of grass, and a worm