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 Title
1	Organizing Things into Categories
2	Solids, Liquids, and Gases
3	Gravity Introduction
4	States of Matter and Temperature Changes
5	Orbits and Gravity in Space
6	What is Energy?
7	Air is Real
8	Energy Transformation
9	Air and the Atmosphere
10	Distinguishing Living and Nonliving Things
11	Matter is Made of Particles
12	Light and Shadows
13	Changes in Particles
14	Technology, Tools, and the Engineering Process
15	Reversible and Nonreversible Changes

Semester 2 — Lessons 16–30

#	Lesson Title
16	Sound and Vibrations
17	Kinetic and Potential Energy
18	How Sound and Light Travel in Waves
19	Plants vs Animals
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 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 Title
31	Matter vs Energy
32	Identifying Local Plants and Animals
33	Air Pressure
34	Habitats
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	Clouds and Weather Patterns

Semester 4 — Lessons 46–60

#	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 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	Simple Machines and Work
60	Plants, Soil, and Erosion

Semester 5 — Lessons 61–75

#	Lesson Title
61	Earth's Orbit and 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	Nervous System and Movement
73	Mass vs Weight
74	Arthropods and External Skeletons
75	Action and Reaction Forces

Semester 6 — Lessons 76–90

#	Lesson Title
76	Introduction to Friction
77	Rocks and Minerals
78	Erosion, Sediment, and Fossil Formation
79	The Digestive System
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