Grades 6–8 · Semester 2 · 58 readings
Follow connected processes
Begin with energy and environment. Follow the connected explanations through routes and production, keeping each small group together and taking time to understand its illustrations.
Start reading →One possible pace is 3–4 explanations a week over 16 weeks. Keep each small unit together, revisit its pictures and allow more time whenever an idea needs it.
Unit 1Energy and environment4 readings ⌄
Solar storage, heat exchange, food webs and drying explain where energy moves and which conditions matter.
Unit 2Communities across space and time3 readings ⌄
Species change their surroundings, affect their neighbors and depend on connections between habitats.
Unit 3Matter moving through Earth and life3 readings ⌄
Follow carbon and nitrogen across reservoirs, then explain how excess nutrients alter oxygen supply.
Unit 4Reproduction and reactions3 readings ⌄
Pollination, inherited gene versions and enzymes explain distinct processes involved in living systems.
Unit 5Language and rules4 readings ⌄
Ambiguity, implications, definitions and metaphor show why wording changes what a statement establishes.
Unit 6Sound, light and context4 readings ⌄
Musical timing, string modes, additive light and visual context describe different features of a representation.
- How can we separate pitch from rhythm?Arts & Music
- Why do fixed strings have harmonic modes?Arts & Music
- Why does mixing colored light differ from mixing paint?Arts & Music
- How can context change a line’s apparent length?Arts & Music
Unit 7Sound patterns and shared time2 readings ⌄
Voices and rhythmic cycles carry information through patterns that listeners learn to recognize.
Unit 8Electric sound makers2 readings ⌄
Discover how moving strings and electronic circuits become musical signals.
Unit 9Records and decisions4 readings ⌄
Accounts, missing archives, source tracing and election rules explain different limits on a public conclusion.
- How can two accounts tell different parts of a story?History & Evidence
- Can surviving records show everyone’s view?History & Evidence
- How do we trace a claim back to its evidence?Societies
- How can the same votes give different rule outcomes?Societies
Unit 10Evidence and coordination in healthcare3 readings ⌄
See how measurements, supplies and changing needs become coordinated care.
Unit 11From public rules to public action2 readings ⌄
Distinguish writing a rule from organizing the people and resources that carry it out.
Unit 12Chance and comparisons5 readings ⌄
Probability, changing price bases, markets, external costs and sampling each depend on what is being compared and under which assumptions.
- How do two independent coin tosses give four possible outcomes?Mathematics
- Why don’t successive discounts simply add?Everyday Life
- How can buyers and sellers affect a market price?Societies
- How can production costs reach people outside a sale?Societies
- How can who is included change a survey result?Societies
Unit 13People, places and planning2 readings ⌄
Use population change and spatial information to understand how service needs develop.
Unit 14Different electrical effects2 readings ⌄
Charge interactions and microwave heating involve distinct electrical mechanisms.
- Why can a charged object attract a neutral one?Materials & Matter
- Why can microwaves heat material unevenly?Everyday Life
Unit 15Delivery and protection3 readings ⌄
A pneumatic cylinder, a fuse and a district heating loop have different roles in directing a system’s behavior.
Unit 16Light and focus3 readings ⌄
Refraction, eye accommodation and corrective lenses connect light paths with the position of an image.
Unit 17Environment and conditions3 readings ⌄
Upwelling, stomatal opening and eclipse alignment depend on different environmental or geometric conditions.
Unit 18The changing underground water system3 readings ⌄
Connect wells, coastal salinity and drought through water movement, storage and pressure.
- Why does the water table dip around a pumping well?Earth & Space
- How can seawater enter a freshwater well?Earth & Space
- Why can a drought continue after a heavy rainstorm?Earth & Space
Unit 19Routes and production3 readings ⌄
Container transport, production costs and distance-time slopes make different aspects of movement and output explicit.