Chapter 5

(1) Familiar physical phenomena
A. Light and sound
B. Forces and pressures

(2) Substance found in our surroundings
A. Aspect of substance
B. Aqueous solutions

(3) Electric current and its utilization
A. Electric current
B. Utilization of electric current

(4) Chemical change and atoms, molecules
A. Formations of substances
B. Chemical change and mass of substances

(5) Regularity of motions
A. Regularity of motions

(6) Substances and utilization of chemical reactions
A. Substances and utilization of chemical reactions

(7) Science and technology and human beings
A. Energy resources
B. Science and technology and human beings*

(1) Kinds of plants and their lives
A. Observations
B. Constructions of plants' body
C. Groups of plants

(2) The Earth's crust and its changes
A. Strata and past appearance
B. Volcanoes and earthquakes

(3) Kinds of animals and their lives
A. Constructions of animals' body
B. Groups of animals

(4) Weather and its changes
A. Weather observations
B. Weather changes

(5) Cells of living things and reproduction
A. Living things and cells
B. Reproduction of living things

(6) The Earth and universe
A. The Earth's rotation and revolution
B. The Solar system and stars

(7) Nature and human beings
A. Nature and environment
B. Nature and human beings*

* Selective