ກ່ຽວກັບປຶ້ມ e-book ນີ້
Some objects can be scratched or dented easily. Others can take a beating and still look as good as new. This may be one sign of hardness. This accessible narrative introduces basic concepts about the property of hardness of matter. Readers learn how to identify hardness through senses and tests, as well as how hardness may change. A hands-on activity gives readers a chance to experience the concepts in action. Fast facts and vivid images offer additional nuggets of information. This volume supports students' ability to "classify different kinds of materials by their observable properties" in second grade as specified in the Next Generation Science Standards.
Some objects can be scratched or dented easily. Others can take a beating and still look as good as new. This may be one sign of hardness. This accessible narrative introduces basic concepts about the property of hardness of matter. Readers learn how to identify hardness through senses and tests,...
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