You will hear a recording. Select the paragraph that best relates to the recording.


(1) Auroras appear as colorful streams of light in the sky in high northern and southern latitudes. They are caused by three things: nitrogen atoms getting excited, solar winds in the Earth’s magnetic field, and electrons in oxygen atoms giving off energy.

(2) Aurora australis are seen in the Northern Hemisphere in March and November. When nitrogen atoms in the atmosphere get excited, the magnificent green lights appear in the sky.

(3) Students are confused about the effects of Earth magnetic field. When solar winds reach the Earth’s magnetic field, electrons in oxygen atoms give off energy. Thus, auroras are the result of solar winds hitting magnetic field.

« Previous                                                  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20                                                   Next »