Today, the air we breathe has lots of oxygen – over 20 percent! But that wasn’t always the case.
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Volcanoes are found on other planets and moons across the solar system. The lava they erupt provides information on how other planets and moons formed.
If humans discovered aliens, what would they look like? And where would we find them?
Today, the air we breathe has lots of oxygen – over 20 percent! But that wasn’t always the case.
The surface of lava can appear smooth, rough, jagged, and sometimes like a pile of construction rubble. What are the stories behind these surface features and how did they form?
