Chemistry · KS3 Y7 · Earth & Atmosphere
Structure of the Earth
Structure of the EarthFree3:36Heddy Score 3 of 7, below the standard
What you need to know
- By composition the Earth has three main layers: a thin rocky crust, the mantle and the core.
- Oceanic crust is thin and made of dense basalt, while continental crust is thicker and rich in less dense granite.
- The mantle is hot solid rock that can flow very slowly; the core is mostly iron and nickel, with a liquid outer core and a solid inner core.
- The crust and upper mantle form the rigid lithosphere, which is broken into tectonic plates that move on the asthenosphere.
In this clip
Runs 3:36, from 0:09 to 3:45 of the full video.
Heddy ScoreSeven checks every clip must pass before students see it: trusted, on the map, accurate, focused, accessible, safe, and proven by students.3/7, Below the standard
See the seven stars
- Trusted source · passed. The creator's own upload, live and playable here.
- On the map · not judged yet. A teacher watched it: it mainly teaches this map topic.
- Spec-true · not judged yet. Accurate, and right for the current UK specification.
- Focused · passed. One idea, short enough to watch in one go.
- Accessible · passed. Good captions, clear sound and pictures.
- Safe for children · not judged yet. Right for 11 to 16 year olds, with no sales pitch.
- Proven · not judged yet. Earned from our students: they learn from it, find it helpful and watch it to the end.
Our students
Not enough students yet
Our own students' answers. These are what move ★7 Proven.On YouTube
How the Heddy Score works764K views · 5.14K likes · MooMooMath and Science 642K subscribers
As reported by YouTube on 2026-11-02. Not part of the Heddy Score.Why we picked it
A tidy animated cross-section of the Earth that gives a property for each layer, matching what KS3 students need to describe.
MooMooMath and Science on YouTubechecked 2026-10-22
Plays from youtube-nocookie.com. No YouTube cookies until you press play.