The correct answer is: C. 64,000 km above the earth’s surface.
The Earth’s magnetic field is a complex field that extends from the Earth’s core to far beyond the planet’s atmosphere. It is generated by the movement of molten iron in the Earth’s outer core. The magnetic field protects the Earth from harmful radiation from the sun and other sources.
The magnetic field is strongest at the Earth’s poles and weakest at the equator. It is also distorted by the solar wind, a stream of charged particles from the sun. The solar wind causes the magnetic field to stretch and fold, creating a region around the Earth called the magnetosphere.
The magnetosphere extends to about 64,000 km above the Earth’s surface. It is shaped like a teardrop, with the wide end facing the sun. The magnetosphere protects the Earth from the solar wind and other harmful radiation.
The Earth’s magnetic field is constantly changing. It is affected by the sun’s activity, the Earth’s rotation, and the movement of the Earth’s core. These changes can cause the magnetic field to weaken or strengthen, and to shift in position.
The Earth’s magnetic field is a vital part of the planet’s atmosphere and climate. It protects the Earth from harmful radiation and helps to regulate the Earth’s temperature. The magnetic field is also important for navigation and communication.
The Earth’s magnetic field is a complex and dynamic system that is essential to the planet’s survival. It is a fascinating and important part of our world.
The other options are incorrect because they do not represent the true extent of the Earth’s magnetic field. Option A is too small, and Option B is too large. Option D is incorrect because it is not a specific distance.