7 3 Relationship Planetary Surfaces Astronomy 2e
Tens to lots of of 1000’s of years before a major volcanic eruption, magma builds up beneath the surface of the Earth. In the magma, crystals of zirconium silicate (called zircons), as nicely as other crystals, type. These zircon crystals are tiny — only a tenth of a millimeter long — but they are the …
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