Different types of seismic waves behave differently in different materials. Their behavior can tell scientists about the material they travel through. Earth must contain metal. Its density, and the fact that it has a magnetic field, require it.
CK-12 (Middle School)
How can scientists learn about the interior of the Earth without being able to see or touch it?
RST.1 - Analysis & Evidence, RST.2 - Main Ideas
DEPTH OF KNOWLEDGE (DOK) LEVELS:
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