JLKR+3.4

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Vocabulary
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Earth's Moon

 * moon's surface has craters in it
 * lava flowed on the moon's smooth areas, which is why they are smooth
 * happened more than three billion years ago

Volcanoes on Venus

 * Venus has tons of volcanoes
 * scientists are trying to find evidence that the volcanoes on Venus are still active
 * like earth, Venus has volcanic mountains and other features that are probably made of thin lava
 * thin lava produces gently sloping shield volcanoes with broad bases, as well as long, river-like lava flows

Volcanoes on Mars

 * fewer volcanoes on Mars than Venus
 * largest volcano is on Mars
 * called Olympus Mons

Volcanoes on Distant Moons

 * only two other places in the solar system where volcanic eruptions have been observed
 * Io, a moon of planet Jupiter
 * Triton, a moon of planet Neptune