GEOLOGY

Detailed explanation-1: -As Earth’s magnetic field varies over time, the positions of the North and South Magnetic Poles gradually change. Magnetic declination-the angle between magnetic North and true North-at a given location also changes over time.

Detailed explanation-2: -Magnetic declination (sometimes called magnetic variation) is the angle between magnetic north and true north. Declination is positive when this angle is east of true north and negative when it is west. Magnetic declination changes over time, and with location.

Detailed explanation-3: -Since the forces that generate our magnetic field are constantly changing, the field itself is also in continual flux, its strength waxing and waning over time. This causes the location of Earth’s magnetic north and south poles to gradually shift, and to even completely flip locations every 300, 000 years or so.

Detailed explanation-4: -This means that everything on the planet will be exposed to higher levels of radiation, which over time could produce an increase in diseases like cancer, as well as harm delicate spacecraft and power grids on Earth.

Detailed explanation-5: -As one moves across the surface of the globe, lines of constant magnetic declination are called isogonic lines. As the earth’s magnetic field varies over time, the positions of the north and south magnetic poles gradually change. The magnetic declination at a given location also changes over time.