Question

The atmosphere is held to the earth by:
A. gravity
B. wind
C. clouds
D. earth's magnetic field

Answer 1

Hint – Here we should think about some force which attracts the atmosphere toward earth. Doing like this you will get the right answer.

Complete answer:
The magnetic field of Earth, also known as the geomagnetic field, is a magnetic field that stretches from inside the Earth to space, where it interacts with the solar wind, a stream of charged particles originating from the Sun.

The Earth's magnetic field is caused by the currents of energy flowing through the molten core. These currents are hundreds of miles wide and flow thousands of miles per hour as the earth rotates. The strong magnetic field passes through the center of the earth, passes through the crust, and reaches space.

The world, because of gravity, pulls all objects into itself. In reality, the air around our planet is kept around by gravity, and the envelope of air around the planet is called the atmosphere.
Hence, the correct option is A.

Note – In order to solve this problem we need to know that the The atmosphere can not be protected by air, clouds or earth magnetic fields unless and until there is an irresistible force against the surface, and that force is the only force of gravitation.