It is basalt
Not on another planet per se. Venus and Mars have volcanoes, but none have been observed to erupt. Volcanic eruptions have been observed on Io, one of the moons of Jupiter.
Our space probes and telescopes have observed volcanic eruptions on Io.
Jupiter's moon Io may be the most volcanically active object in the solar system. Some of Io's volcanoes have been observed to erupt into orbit.
Io, one of Jupiter's moons, is known to be volcanically active. It has more than 400 active volcanoes, making it the most geologically active body in our solar system. The volcanic activity on Io is a result of tidal heating caused by its interactions with Jupiter and its neighboring moons.
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How was the planet Uranus been observed
Judgement based on what has been observed is a conclusion.
The Higgs boson. In fact, it has not been observed by 2011.
Two percent========================Answer #2:I doubt it.The number of known 'moons' ... natural satellites of the planets ...in our solar system is currently somewhere around 250. Eruptionshave been observed on, at most, two or three of them.
There are over 400 active volcanoes on Jupiter's moon Io, making it the most geologically active body in the solar system. The volcanic activity is driven by tidal heating caused by gravitational interactions with Jupiter and its neighboring moons.
Io does have cliffs and cracks but it has been overslain by lava
"Observed" is a word that means something has been noticed.