Click each layer to drill down through the Earth! From thin crust to the blazing hot inner core — 6,371 km deep!
We've never drilled more than 12 km into the Earth (the Kola Superdeep Borehole). So how do scientists know what's inside? They study seismic waves from earthquakes! Different waves travel at different speeds through solids and liquids, revealing the Earth's internal structure.
Earth's core is roughly the size of Mars. The outer core's liquid iron generates Earth's magnetic field — without it, solar winds would strip away our atmosphere, making Earth uninhabitable.
This free interactive science tool is designed for elementary and middle school students. It uses visual animations, hands-on activities, and quizzes to help kids understand key science concepts. All content is aligned with Next Generation Science Standards (NGSS) and is completely free with no login or account required.
Interactive learning tools like this one help students engage with science in ways that textbooks alone cannot. By clicking, dragging, and experimenting, kids build deeper understanding and retain information better. Research shows that active learning leads to stronger academic outcomes compared to passive reading.
Explore the interactive elements above, then test your knowledge with the built-in quiz. You can retry as many times as you like. Teachers can use this tool on interactive whiteboards or assign it for independent practice. Parents can use it for homeschooling or after-school enrichment.
Last reviewed: April 2026