We all know limestone weathers, but what affects the rate of weathering? Young scientists investigate the physical and chemical weathering of limestone (chalk) through experimentation. First, they conduct trials with different-size chalk, and then they continue the trial with different acid concentrations.

Concepts

limestone, chemical weathering, types of rocks

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Additional Tags

science

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Instructional Ideas

• Have learners graph their data on physical and chemical weathering to visually note relationships

Classroom Considerations

• The activity uses HCl; be sure to go over safety procedures 
• Necessary materials include different concentrations of acid, varying water temperatures, and additional equipment
• The final installment of a five-part series on earth materials and processes

Pros

• Hands-on activity engages learners
• A comic strip to illustrate fossil formations in limestone promotes pupil interest in the subject matter

Cons

• Some questions refer to localities in Virginia, which may be unfamiliar to pupils in other states