ResourcesWeb & Docs
MediaVideo & Audio
CollectionsLessons & Topics
AI Teacher ToolsInstruction & Ideas
new

Resource Types


Grades


Subjects


Standards


Content Curators


Audience

Instructional Strategy

Lexile®

Accessibility

Languages

Curator Rating

Usage Permissions

Included Materials

+
Article
Story Behind the Science

Story Behind the Science: Just How Old Is Earth? [Pdf]

For Students 9th - 10th
Article describing efforts in the 19th and 20th centuries to determine the Earth's age, particularly using naturally occurring radioactivity. It notes that scientific disciplines frequently overlap in the work they do. Questions are...