Explain why the aurora borealis, or northern lights, can
be seen at the North Pole but not at the equator.

(On edge)

Explanation:

Sample response: When charged particles from the Sun enter Earth's magnetosphere, the positive ions and negative ions create a ring current that is opposite Earth's magnetic field. This current reduces Earth's magnetic field especially at the poles. When the charged particles enter Earth's atmosphere at the poles, they collide with other atoms at high-altitude areas and produce the aurora borealis, or northern lights.

heat the gas and measure the pressure

compass can be used day and night, cloudy or sunny