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HMDScience.com provides digital, three-dimensional learning resources aligned with HMH Science Dimensions, featuring interactive physics simulations, digital textbooks, and formative assessments. While primarily a subscription service, free access to related content, including workbooks and teacher guides, is available through educational platforms such as Slideshare and Teachers Pay Teachers.

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3.2 Sound

• Pitch (frequency), loudness (amplitude), Doppler effect
• Speed of sound in air ≈ 343 m/s (20°C)

She shut the laptop.

overview, are available to help schools transition to next-generation science standards. Scientific Investigation Framework HMDScience