Experiment 1:

How do crows drink water? Why?

Answer: The crow put the stone in the bottle, and the water in the bottle rose, so the crow drank the water.

Because the stone occupied the space of water, the water was squeezed up.

Experiment 2:

Take two glasses of the same size, first fill one glass with water, put a pebble in the other glass, and then pour the water from the first glass into the second glass. What will happen and why?

Answer: the second cup can't hold the water in the first cup, because there is a stone in the second cup, and the stone takes up the space of water, so it can't hold it.

Experiment 3:

The size of TV, DVD player and mobile phone, which is bigger or smaller?

Answer: It can be seen from observation that TV sets are the largest, followed by DVD players.

The mobile phone is the smallest.