1. Which of the following best describes how the 2 scientists explain how craters are removed from Europa's surface?
A) Scientist 1:Sublimation Scientist 2: Filled in by water
B) Scientist 1: Filled in by water Scientist 2: Sublimation
O C) Scientist 1: Worn smooth by wind Scientist 2: Sublimation
D) Scientist 1: Worn smooth by wind Scientist 2: Filled in by water

How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.