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AcrossA1: Frozen balls of ice.A7: Metal that gets red in touch
of oxygen.
 C2: The gases around a planet.
 E2: Kind of mountain with openings.
Lava, ashes, ... go out through them.
 H3: Opening of a volcano.
 
Down3A: that travel through space.6C: Bright body in the sky.
 11B: Name of a gas.
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