Traditional Culture Encyclopedia - Weather inquiry - Read the following materials: Shanxi Youth Daily reported on June 1 day, 2005: On May 3 1 day, there were thunderstorms in Beijing, Shijingshan and Daxing, accompanied by

Read the following materials: Shanxi Youth Daily reported on June 1 day, 2005: On May 3 1 day, there were thunderstorms in Beijing, Shijingshan and Daxing, accompanied by

① The appearance of pits shows that force can change the shape of objects;

(2) Hail falls from the sky because the gravity direction is vertical downward;

③ The formation of rain is a liquefaction phenomenon;

(4) Photographing is convex lens imaging, which is the principle of the camera;

Hearing thunder is caused by air vibration.

So the answer is:

? Illustrated phenomenon principle (principle or concept) related to physics, such as hail solidification 1 rain liquefaction 2 lightning vibration sound.