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Grades 6–8 · Semester 6 · 55 readings

Look deeper into the wider world

Begin with changing stars and traveling knowledge. Follow the connected explanations through evidence and signals across a journey, keeping each small group together and taking time to understand its illustrations.

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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 1Changing stars and traveling knowledge2 readings ⌄

Different stellar masses lead to different endings; exchanges connect a historical network.

  1. Why do different stars have different endings?Earth & Space
  2. How could goods and ideas travel farther than one merchant?History & Evidence
Unit 2Evidence and the stories we connect2 readings ⌄

Selected observations and neighboring film shots can shape the conclusions we draw.

  1. How can an expectation shape the evidence we notice?Organisms
  2. How can a film cut suggest a connection that was never filmed?Arts & Music
Unit 3Signals from distant places2 readings ⌄

Finite signal speed shapes rover communication; matter outside a black hole can emit light.

  1. Why can a Mars rover not answer Earth immediately?Earth & Space
  2. How can a black hole have bright surroundings?Earth & Space
Unit 4Choosing sites and detecting buried features2 readings ⌄

River locations offer changing opportunities; reflected radar pulses reveal material contrasts.

  1. Why did many cities grow beside rivers?History & Evidence
  2. How can radar reveal a possible buried wall?History & Evidence
Unit 5Reading water, wind and seasons3 readings ⌄

People combine observations of a particular place with designs and calendars that fit its conditions.

  1. How can a qanat bring groundwater to a village without a pump?Systems
  2. How can a windcatcher ventilate a room without an electric fan?Systems
  3. How can a calendar connect Moon phases with knowledge of a particular place?History & Evidence
Unit 6Social information and memorable examples2 readings ⌄

Group responses and accessible memories can influence a judgment in different ways.

  1. Why might someone follow a group while still feeling unsure?Organisms
  2. Why can a memorable event seem more common than it is?Organisms
Unit 7How a structure stands and a view changes2 readings ⌄

Arches transfer loads to supports; camera position changes relative image sizes.

  1. How can a flying buttress help support a tall wall with windows?Arts & Music
  2. Why does moving a camera change the sizes of near and far objects?Arts & Music
Unit 8Molecules at useful surfaces4 readings ⌄

Porous materials, polymer networks and metal deposits turn microscopic interactions into familiar functions.

  1. How can a little silica-gel packet help keep a box dry?Materials & Matter
  2. How can activated carbon remove some dissolved substances from water?Materials & Matter
  3. How can dry granules inside a diaper become a water-filled gel?Everyday Life
  4. How can electricity add a thin metal coating to another object?Materials & Matter
Unit 9How useful solids change4 readings ⌄

Protective reactions, growing crystals, bonded layers and molecular links give materials different properties.

  1. Why can zinc protect steel even beside a small scratch?Materials & Matter
  2. Why does wet plaster become solid before all its water has dried?Materials & Matter
  3. How can laminated glass hold broken pieces together?Materials & Matter
  4. How does vulcanization help rubber keep its shape?Materials & Matter
Unit 10Hidden work inside the body4 readings ⌄

Moving cells, dispersed fat, blood formation and elastic tissue support everyday body functions.

  1. How do tiny moving cilia help clear the airways?Organisms
  2. How does bile help the body handle fat in watery digestive fluid?Organisms
  3. How can the inside of a bone help replace blood cells?Organisms
  4. How can the Achilles tendon return energy during a running step?Organisms
Unit 11Different ways to stay alive4 readings ⌄

Air tubes, stored stings, water channels and dormant seeds meet different biological needs.

  1. How can an insect deliver air without lungs like ours?Organisms
  2. How can a jellyfish tentacle release a microscopic sting so quickly?Organisms
  3. How can a sponge feed while staying attached to one place?Organisms
  4. Why can some buried seeds begin growing after a fire?Organisms
Unit 12Routes through changing environments4 readings ⌄

Ice, electrical discharge, beach sand and sediment-rich water follow routes shaped by different physical conditions.

  1. How can a glacier flow while most of it remains solid ice?Earth & Space
  2. How does a lightning-protection system give a strike a route into the ground?Systems
  3. How can waves move beach sand sideways along a coast?Earth & Space
  4. How can a muddy current rush downhill beneath the ocean?Earth & Space
Unit 13Balances around a changing planet4 readings ⌄

Ground forces, wetland growth, city heat and atmospheric chemistry reveal several kinds of environmental balance.

  1. Why can wet ground lose strength during strong earthquake shaking?Earth & Space
  2. How can a salt marsh build its surface upward?Earth & Space
  3. Why can a city stay warmer than nearby countryside after sunset?Earth & Space
  4. How does a thin amount of ozone high above Earth reduce ultraviolet exposure?Earth & Space
Unit 14Materials and timing in public systems4 readings ⌄

Rail joints, pumping stations, electricity timing and concrete chemistry support large shared services.

  1. Why do some railway rails have small gaps between their ends?Systems
  2. How can wastewater travel uphill on its way to treatment?Systems
  3. How can changing when electricity is used help a power system?Societies
  4. How does concrete become hard even when it is kept moist?Materials & Matter
Unit 15Structures that respond to forces4 readings ⌄

Heat-responsive seals, speed governors, pressure signals and angled cables show different ways to manage changing loads.

  1. How can a thin strip around a fire door expand to fill a gap?Everyday Life
  2. How can an elevator detect excessive speed mechanically?Machines
  3. Why can a drop in a train’s brake-pipe pressure apply its brakes?Machines
  4. How do a cable-stayed bridge’s straight cables help hold up its road?Systems
Unit 16Surfaces, streams and creative tools4 readings ⌄

Fresh plaster, bent wood, cutting streams and flowing water connect material processes with human purposes.

  1. How can a fresco become part of a plaster wall?Arts & Music
  2. How can steam help bend a wooden part without cutting it?Arts & Music
  3. How can a waterjet cut through a solid material?Machines
  4. How could falling water level mark the passing of time?History & Evidence
Unit 17Evidence and signals across a journey4 readings ⌄

Flotation recovers evidence, allocation rules translate counts, tonewheels generate signals and cold chains coordinate protection.

  1. How can water help archaeologists find tiny ancient seeds?History & Evidence
  2. Why does sharing representative seats require more than rounding percentages?Societies
  3. How could spinning metal wheels help an organ make musical tones?Arts & Music
  4. How can chilled food stay cold through several different journeys?Systems