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CK-12 Earth Science covers the study of Earth - its minerals and energy resources, processes inside and on its surface, its past, water, weather and climate, the environment and human actions, and astronomy.
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I am new to the ck12.org Earth Science material, but I have already found several resources that have helped my students to grasp concepts. My school uses ipads in the classroom, so having activities that work on the ipad is a great plus.