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"Changes in Temperature throughout the Year" Changes in the Four Seasons PPT Courseware 2
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"Changes of Baking Soda and White Vinegar" Changes of Substances PPT Courseware 2
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"What changes have occurred in matter" Changes in matter PPT courseware 2
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"Changes in Temperature throughout the Year" Changes in the Four Seasons PPT Courseware 3
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Download the PPT of "The Ice Melts" about the changes of temperature and water
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"Changes in the State of Matter in Life and Technology" PPT courseware on the state of matter and its changes
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"Changes in the State of Matter in Life and Technology" PPT courseware on the state of matter and its changes
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"The Formation of Pebbles" Changes in the Earth's Surface PPT Courseware
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"Heat Engine" mechanical energy, internal energy and their conversion PPT courseware
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