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Systems, Scale, Time & Change | The Cross-Cutting Ideas of Science

SCIENCE HUB · SYSTEMS, SCALE, TIME & CHANGE

The Most Transferable Science Ideas Are Often the Ones That Appear Everywhere

A cell, circuit, ecosystem, chemical reaction and climate system are not the same thing. But each can force the learner to define a boundary, track flows, identify constraints, follow change through time and decide which scale makes the mechanism visible.

The Cross-Cutting System Library

Define the System

Track What Moves

Track What Constrains

Time Changes Causation

Models Must Match the Scale

See the Same Pattern Across Disciplines

Cross-cutting idea	Biology	Chemistry	Physics	Ecology
Boundary	cell membrane / organism	reaction mixture	system for energy accounting	population / ecosystem
Flow	blood, ions, signals	particles, heat, concentration	energy, charge, momentum	matter and energy through food webs
Constraint	limiting nutrient / regulation	limiting reactant / equilibrium	friction / resistance / conservation	resources / carrying conditions
Time	development / regulation	reaction rate	motion / oscillation	succession / population change

This corridor is where the Science Hub becomes more than four school subjects. It teaches the transferable structures that let a learner recognise the same kind of problem in a different scientific world.

Connected corridors: Biology · Chemistry · Physics · Ecology · Science Hub.