20 17 what does the first volume of the science textbook for the fourth grade of primary school include?

Water can dissolve some substances.

Lesson 2 How does water dissolve matter?

Lesson 3 Dissolution between liquids

Lesson 4 Solubility of Different Substances in Water

Lesson 5 Fast and Slow Dissolution

Lesson 6 How much salt can a glass of water dissolve?

Lesson 7 the method of separating salt from water

The second chapter, sound.

Listen to the sound

Lesson 2 How does sound come about?

Lesson 3 the change of sound

Lesson 4 Explore the Pitch Change of Ruler

Lesson 5 How does sound spread?

Lesson 6 How do we hear the sound?

Protect our hearing.

Chapter III, Weather

We care about the weather.

Lesson 2 Weather Calendar

Lesson 3 temperature and air temperature

Lesson 4 Wind Direction and Wind Speed

Lesson 5 Measurement of Rainfall

Lesson 6 Cloud Observation

Lesson 7 summarizes our weather observation.

Chapter IV Our Bodies

Body structure

Lesson 2 bones, joints and muscles

Lesson 3 What happens when you jump (1)

Lesson 4 What happens when you jump (2)

Lesson 5 Food Travel in the Body

Lesson 6 Changes of Oral Cavity

Lesson 7 Take care of our bodies.