Question: Does a toy car travel farther on tile or carpet? Keep the ramp and car the same, change only the surface, measure each trip, and explain the result from the measurements.
BUILD AN INVESTIGATION
Turn curiosity into a testable question
Choose what to change and what to measure. A useful scientific question names both and can be answered with observations or measurements.
Questionwhat the investigation asksChanged variablethe one factor deliberately changedMeasured resultthe outcome recorded as evidence
TESTABLE QUESTIONHow does surface affect the distance traveled by the same toy car?
ChangesurfaceMeasuredistance traveledKeep sametoy car and release method
This can be investigated. It identifies one change and one measurable result.
1 Notice & ask→2 Plan & explore→3 Record evidence→4 Explain & share
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LESSON 1.2 · SC.3.N.1.2
Fair Tests and Team Results
Learning goal: Compare observations fairly and explain why groups may collect different results.
What to know
Groups should use the same tools and procedure before comparing results.
Small differences can come from how a tool is read, where it is placed, timing, or natural variation.
Repeating trials helps reveal whether a result is dependable.
WATCH & NOTICE
Be a Field Scientist!
From SciShow Kids
Notice how questions, observations, and a field journal work together.
Two teams time the same ice cube melting. Their results differ by 20 seconds. First check start times, thermometer placement, room location, and measurement method—not which team you like best.
TEAM RESULTS LAB
Different results are a reason to check—not to choose favorites
Run matching trials for two teams. Adjust one possible measurement difference, then repeat trials to see whether the evidence becomes more dependable.
Fair testsame procedure except for the tested variableTrialone repetition of a testVariationsmall differences among measurements
Team A
—
Team B
—
No trials yet. Keep tools and procedure the same, then repeat at least three times.
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LESSON 1.3 · SC.3.N.1.3
Science Records and Data
Learning goal: Choose a clear way to record observations and measurements.
What to know
Records may be written notes, labeled drawings, tables, or simple graphs.
Include labels and measurement units so another person understands the data.
Record results during the investigation instead of relying on memory.
WATCH & NOTICE
Be a Field Scientist!
From SciShow Kids
Notice how questions, observations, and a field journal work together.
A class claims shade makes soil stay wetter. Another team asks to see the measurements and repeats the test. Agreement after checking makes the explanation stronger.
SCIENTIST PEER REVIEW
Check whether the evidence supports the claim
Review a class investigation about shade and soil moisture. Ask respectful questions about its method, records, and conclusion.
Claima statement offered as an explanationMethodthe procedure usedPeer reviewother scientists questioning and checking work
Review strength0 of 4 checks
Begin the review. Asking questions improves an investigation; it is not an attack on the scientist.
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LESSON 1.5 · SC.3.N.1.6 · SC.3.N.1.7
Observation, Inference, Evidence
Learning goal: Separate what was directly observed from an inference and use empirical evidence.
What to know
An observation is something noticed or measured directly.
An inference is a reasonable idea based on observations and prior knowledge.
Empirical evidence is observed or measured information used to check an explanation.
WATCH & NOTICE
Be a Field Scientist!
From SciShow Kids
Notice how questions, observations, and a field journal work together.
Observation: the sidewalk is wet and the rain gauge contains 1 cm of water. Inference: it rained recently. The direct observations are evidence for—but are not identical to—the inference.
OBSERVATION OR INFERENCE?
Separate what you detect from what you explain
Inspect the scene, then classify each statement. Observations come directly from senses or tools; inferences are reasonable ideas built from observations and prior knowledge.
Observationsomething noticed or measured directlyInferencean explanation based on observationsEmpirical evidenceobserved or measured information
☁️
1 cm
Current scene: wet pavement, puddle, and 1 cm water in a rain gauge
“The rain gauge contains 1 cm of water.”Statement 1 of 5
Choose a category. Ask: can this be directly seen or measured in the scene?
Observation
“The plant is 14 cm tall.”
Directly measured
Inference
“The plant grew toward the light.”
Explanation based on evidence
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LESSON 1.6 · SC.3.N.3.1 · SC.3.N.3.2 · SC.3.N.3.3
Science Words and Models
Learning goal: Use science vocabulary precisely and explain the usefulness and limits of models.
What to know
Science words such as cell, energy, heat, and evidence can be more specific than everyday uses.
Models help people understand or explain objects, systems, and events.
Every model is an approximation: it represents important features but cannot show everything perfectly.
WATCH & NOTICE
Be a Field Scientist!
From SciShow Kids
Notice how questions, observations, and a field journal work together.
A globe models Earth’s shape and locations, but it cannot show every tree, cloud, or building. Its limits do not make it useless; they tell us what questions it can answer.
MODEL TOOLBOX
Every model is useful—and every model has limits
Choose a question and inspect three Earth models. The best model depends on what you need to understand; no model shows everything.
Modela representation used to explain or studyUseful featurewhat the model shows wellLimitationwhat the model leaves out or simplifies
USEFUL FOR THIS QUESTIONShows Earth’s round shape and broad ocean/continent locations.
IMPORTANT LIMITCannot show every building, cloud, or small surface detail.
FIT FOR QUESTIONGood choice
A model can be valuable without being perfect. State what it represents and what it cannot answer.
Earth model
Useful: shows shape and large locations. Limit: size, distances, and details are simplified.
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Unit 1 benchmark map
Crystal Lake’s unit outline is mapped to Florida’s official Grade 3 science course. Lessons group connected ideas so benchmarks are learned in context.
SC.3.N.1.1Ask, Explore, ExplainSC.3.N.1.2Fair Tests and Team ResultsSC.3.N.1.3Science Records and DataSC.3.N.1.4 · SC.3.N.1.5Share, Question, CheckSC.3.N.1.6 · SC.3.N.1.7Observation, Inference, EvidenceSC.3.N.3.1 · SC.3.N.3.2 · SC.3.N.3.3Science Words and Models