What evidence do we have that volcanism occurs on Io?
What will be an ideal response?
Images from spacecraft reveal that Io has over 100 volcanic vents on its surface. The active volcanoes throw sulfur-rich gas and ash high above the surface. That ash falls back to bury the surface at a rate of a few millimeters a year. This explains why you see no impact craters on Io—they are covered up as fast as they form.
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The atomic nuclei of the same element always have the same number of neutrons
Indicate whether the statement is true or false
The total mass of a galaxy tends to be only slightly larger than the visible mass
Indicate whether the statement is true or false
Neutral hydrogen atoms are best studied from their energy given off as
A) 21-cm waves in the radio region. B) 0.2 nm as X-rays. C) 121.3 nm as Lyman alpha emission in the UV. D) red hydrogen alpha emission, at 656.3 nm. E) Neutral hydrogen gives off no detectable radiation, since it is cold, not hot.
The first 87% of geologic time is often called
a. Hadean time. b. Pangaean time. c. Precambrian time. d. Proterozoic time.