← 7th Grade Science
Life Science U1-L3 Life Science

How We Know What We Know

Most people think science is a body of facts to memorise. It is closer to a set of rules for arguing honestly about what is true.

Teacher Notes

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Lesson Goal

Students will learn that science is not simply a collection of facts. It is a method of asking questions, testing ideas, studying evidence, and correcting mistakes.

Key Concepts

The scientific process begins with observation. Observations lead to questions, and questions can lead to a hypothesis, which is a possible explanation that can be tested. Scientists then design experiments, compare results, and draw conclusions based on evidence.

Students should also understand that a scientific theory and a scientific law are different. A theory explains patterns or events using a large body of evidence. A law describes a consistent pattern or relationship in nature. A theory does not eventually become a law.

Teaching Suggestion

Begin with something simple. Drop a pencil and ask, “Why did it fall?” The student observed something, but observation alone does not explain it. This is a good way to introduce the difference between seeing something happen and investigating why it happens.

Near the end, remind students that science is an excellent tool for studying the physical world, but it cannot answer every kind of question. Scripture teaches that the world science investigates is God's creation.

Key Vocabulary

Observation
Something noticed or measured about the natural world.
Hypothesis
A possible explanation or answer that can be tested using evidence.
Control
Something that provides a comparison in an experiment.
Theory
A broad explanation supported by a large amount of evidence and repeated testing.
Law
A description of a consistent pattern or relationship observed in nature.
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Before You Start

The Words

The words this lesson uses. Tap a card to see what it means, then come back to them whenever a question uses one.

Part One

The Questions

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Questions about the story you just read. Pick your answer straight off, or press Find it in the story if you would rather hunt for the sentence first.

Part Two

Vocabulary Check

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The word cards are at the top of this page. Look back at them as often as you need, then answer.

When you finish: write the answers out in your own words — not copied word for word from the choices. Saying it your own way is the part that proves you understood it. Then use Print Answer Sheet for a one-page record of what was answered and scored.
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