Less expensive. The cost difference between building a roundabout and a traffic signal is comparable. Where long-term costs are considered, roundabouts eliminate hardware, maintenance and electrical costs associated with traffic signals, which can cost between $5,000 and $10,000 per year.Roundabouts are also more effective during power outages.here long-term costs are considered, roundabouts eliminate hardware, maintenance and electrical costs associated with traffic signals, which can cost between $5,000 and $10,000 per year. Roundabouts are also more effective during power outages.
THE EARTH'S MAGNETOSPHERE. The magnetosphere is the Earth's magnetic environment. The Earth is a huge dipole (2-pole) magnet. The Earth's magnetic field is probably cause by its molten iron-nickel core. This magnetic field is aligned with the north and south poles, and has reversed many times during geologic history.
  The Earth's magnetic field is called the Magnetosphere. Loops of magnetic energy coupling the north and south pole that trap energetic subatomic particles are called the â¦ Van Allen belt.f Earth did not have a magnetic field then all Ionically charged particles from the sun would enter earth's Ionosphere and over charge it causing global weather changes. This â¦ happens when Sun spot activity is low.