Earth's protective magnetic field
In the first century A.D., in China, it was recognized that the Earth is surrounded by a magnetic field. What generated it was a mystery until the discovery of the planet’s molten iron core. The liquid outer core flows because of convection and the rotation of the Earth. The flow creates an electric current, which produces the magnetic field. This field protects the Earth by deflecting the lethal, high-energy atomic particles streaming from the Sun.
Topic: Earth Science
Subtopic: Earth Structure
Keywords: Heat--Convection, Earth (Planet)--Rotation, Geology, Structural, Earth (Planet)--Core, Magnetic fields