Interactive
Grades 1–5
Reversible vs. Irreversible Changes
science
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“irreversible changes” worksheets and activities
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Grades 3–6
What Are Chemical Changes?
physical science
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Interactive
Grades 1–5
Hot or Cold: Reversible or Not?
science
$1.50
Interactive
Grades 1–5
Heating and Cooling Effects
science
$1.50
Passage
Grades 6–9
Precautionary Principle
earth and space science
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