Which of the following do the atoms 14N and 15N have in common?
A) total number of neutrons and electrons
B) number of protons
C) total number of protons and neutrons
D) number of neutrons
Question 2
The lack of large impact craters on the surface of Europa is consistent with
A) active volcanism that is constantly resurfacing the crust
B) the surface being covered with an ocean of liquid water
C) the crust being so thick and hard that impacts leave no marks on the surface
D) a subsurface ocean of water because large impacts will break the thin crust causing water and slushy ice below to flood out and resurface the crust