7th grade Science
10 units matched to the Washington State Learning Standards.
Focus areas
- Chemical reactions
- Ecosystems and the flow of energy
- Earth's surface and resources
Units
Unit 1
Atoms & Elements
Elements versus compounds and mixtures, chemical symbols (H, O, Na, Cl, Fe, Au…), counting atoms in formulas like H₂O and C₆H₁₂O₆, metals and non-metals, and the basics of the periodic table.
Learning standard: MS-PS1-1 · atoms, elements, compounds and simple molecules
Unit 2
Ecosystems
Biotic and abiotic parts of an ecosystem, how they interact, and the limiting factors and carrying capacity that decide how many organisms an ecosystem can support.
Learning standard: MS-LS2-1; MS-LS2-2 · how resources limit populations and how organisms interact in ecosystems
Unit 3
Food Chains & Energy
Producers, consumers and decomposers, food chains and webs, how energy shrinks as it passes up a chain (about 10% each step), and what happens when part of a chain changes.
Learning standard: MS-LS2-3 · energy flowing through food chains and webs
Unit 4
Cycles & Succession
How water, carbon and nitrogen are cycled through ecosystems, why cycling supports sustainability, and the difference between primary and secondary succession.
Learning standard: MS-LS2-3; MS-LS2-4 · matter cycling in ecosystems and how ecosystems change after disturbances
Unit 5
Particles & Mixtures
The particle theory of matter, the states of matter, pure substances versus mixtures, and homogeneous versus heterogeneous mixtures.
Learning standard: MS-PS1-4 · particle models of pure substances and mixtures
Unit 6
How Plants Work
The parts of seed plants and what they do, photosynthesis, gas exchange, transpiration and pollination, and how plant structures suit where a plant grows.
Learning standard: MS-LS1-4; MS-LS1-6 · plant structures for reproduction and photosynthesis
Unit 7
Chemical Reactions
Practices signs of chemical reactions, how properties change when new substances form, conservation of mass, and devices that release or absorb thermal energy through reactions.
Learning standard: MS-PS1-2; MS-PS1-5; MS-PS1-6 · properties change in chemical reactions, atoms are conserved, and reactions can release or absorb energy
Unit 8
Earth's Moving Surface
Practices plate tectonics and evidence from fossils, rocks and continent shapes, the rock cycle, and how processes at different speeds shape Earth's surface, including the Cascade volcanoes.
Learning standard: MS-ESS2-1; MS-ESS2-2; MS-ESS2-3 · the rock cycle, surface processes at different scales, and evidence for plate motion
Unit 9
Resources & Hazards
Practices why Earth's mineral, energy and groundwater resources are unevenly spread, how scientists forecast natural hazards, and designing ways to reduce human impact on the environment.
Learning standard: MS-ESS3-1; MS-ESS3-2; MS-ESS3-3 · uneven distribution of resources, forecasting natural hazards, and reducing human impact
Unit 10
Biodiversity & Puget Sound
Practices why biodiversity and ecosystem services matter, and how to evaluate solutions that protect ecosystems such as Puget Sound, salmon streams and old-growth forests.
Learning standard: MS-LS2-5 · evaluating solutions that maintain biodiversity and ecosystem services
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