Explanation:

Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.

A change in the Earth’s magnetic field resulting in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north is called as geomagnetic reversal. Complete magnetic reversals have happened every 200,000 to 300,000 years over the past 20 million years. But that regularity hasn’t continued, as the last known reversal occurred roughly 780,000 years ago.  Statement 1 is correct.

When Earth formed 4.6 billion years ago, it had almost no atmosphere. As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. The earliest  atmosphere contained carbon dioxide (CO2), methane (CH4), water vapour (H2O), carbon monoxide (CO), a little nitrogen (N), and hydrogen (H). So, statement 2 is incorrect.

Early atmosphere of earth was modified by solar winds. This happened not only in case of the earth, but also in all the terrestrial planets, which were supposed to have lost their primordial atmosphere through the impact of solar winds. Statement 3 is incorrect.