What Evidence Exists of Volcanic Activity on Venus

Multiple Choice

What evidence exists of volcanic activity on Venus?

A) There is no evidence.
B) There is only the evidence of lava flows, which suggests active volcanoes as recently as 10 million years ago.
C) In addition to old lava flows scientists have measured variability of sulfur compounds during the past half century. This suggests active volcanoes now.
D) One of the Venera landers photographed a volcano in the act of erupting.