The groups have organized Earth Day Cleanup Activities since 2000. This year, they opted to allow the entire student body — kindergarten through 12th grade — to participate in an aluminum can ...
Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms ...
NCTM members can browse the extensive archive of Students Explorations in Mathematics activities and materials suitable for grades 5-10. Many activities are hands-on and related to popular topics that ...