Author Question: Why are there no impact craters on the surface of Io? A) It is too small to have been bombarded ... (Read 55 times)

Arii_bell · **on:** Jul 27, 2018

Why are there no impact craters on the surface of Io?

A) It is too small to have been bombarded by planetesimals in the early solar system.
B) Any craters that existed have been eroded through the strong winds on Io's surface.
C) Jupiter's strong gravity attracted the planetesimals more strongly than Io, and thus none landed on its surface.
D) Io did have impact craters, but they have all been buried in lava flows.
E) Io's thick atmosphere obscures the view of the craters.

Question 2

If Saturn takes about 30 years to orbit the Sun, and its rings were seen edge-on in 1995, when did they next appear most open at solstice?

A) 2007 B) 2005 C) 1998 D) 2010 E) 2002