Standard Pace ScheduleThe full course is completed over 6, 15 week semesters. If you school year round this would be 2 years, but it can also be done over 3 years. 

Semester 1 — Lessons 1–15

Lesson	Lesson Title
1	Organizing Things into Categories
2	Solids, Liquids, and Gases Introduction
3	Gravity Introduction
4	States of Matter: Changes with Temperature
5	The Concepts of Horizontal and Vertical
6	What is Energy?
7	Air is Real
8	Energy Transformation
9	Air and the Atmosphere
10	Categorizing the World Around Us
11	Matter is Made of Particles
12	Distinguishing Living Things from Natural Earth and Human Made
13	Changes in Particles with States of Matter
14	Technology, Tools, and Animals
15	Reversible and Nonreversible Changes

Semester 2 — Lessons 16–30

Lesson	Lesson Title
16	Sound and Vibrations
17	Kinetic and Potential Energy
18	How Sound Travels
19	Plants vs. Animals: Key Differences
20	Energy in the Natural World
21	Categories of Materials
22	Where All Food Energy Comes From
23	Properties of Different Materials
24	The Life Cycle Concept
25	Understanding Force
26	Metamorphosis and Variation in Life Cycles
27	How Force and Energy Work Together
28	Animal Adaptations
29	Reading and Drawing Maps
30	Food Chains and Energy Flow

  Semester 3 — Lessons 31–45

Lesson	Lesson Title
31	Matter vs. Energy: What Is the Difference?
32	Identifying Local Plants and Animals
33	Air Pressure
34	Habitats and Why Organisms Live Where They Do
35	Day, Night, and Earth's Rotation
36	Compass Directions
37	Pressure Inside and Outside
38	Properties of Magnets
39	Maps and Real-World Directions
40	Vacuums and Suction
41	Magnetic Fields
42	What Is a Species?
43	Earth as a Magnet
44	Variation Within a Species
45	Air Pressure, Wind, and the Atmosphere

Semester 4 — Lessons 46–60

Lesson	Lesson Title
46	Adaptations for Survival
47	Air as a Mixture of Gases
48	Earth's Landforms
49	Mixtures vs. Chemical Reactions
50	Basic Plant Structure
51	Respiration, Photosynthesis, and the Air
52	How Plants Function
53	Evaporation
54	Plant Reproduction and Seeds
55	Condensation and the Water Cycle
56	Seeds and Germination
57	Biomes and Climate
58	Seedling Growth and Plant Responses
59	Earth's Major Biomes
60	Plants, Soil, and Erosion

  Semester 5 — Lessons 61–75

Lesson	Lesson Title
61	Earth's Orbit and the Seasons
62	Dissolving and Solutions
63	Introduction to Inertia
64	The Skeleton and How It Works
65	How Fast Things Fall
66	Solubility
67	How Muscles Move the Body
68	Crystallization
69	Inertia and Energy
70	Weightlessness and Free Fall
71	Vertebrates and Internal Skeletons
72	The Nervous System and Movement
73	Mass vs. Weight
74	Arthropods and External Skeletons
75	Action and Reaction Forces

Semester 6 — Lessons 76–90

Lesson	Lesson Title
76	Introduction to Friction
77	Rocks and Minerals
78	Erosion, Sediment, and Fossil Formation
79	Wheels and Reducing Friction
80	Crystals and Mineral Structure
81	Limestone and Fossils
82	Friction, Heat, and Energy Loss
83	Soil Composition
84	Time, Sundials, and Earth's Rotation
85	Sedimentary vs. Igneous Rock
86	Air and Water Resistance
87	Rock Layers and Earth's History
88	Body Systems and Energy
89	Introduction to Resources
90	Human Resources and Resource Limits