2. while hiking, you see a fragment of rock drop vertically from the edge of a cliff to the ground below. which of the following best describes the movement of the rock?

a. slide
b. fall
c. slope
d. flow

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Examine the equation. 23490th→23088ra+42he what kind of barrier would you need to block the radioactive particles from this reaction? a.a piece of paper b.a sheet of aluminum foil c. a two-inch block of lead d. a solid concrete block

The arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s . 1.) a. precipitation b. water vapor c. icy debris 2.) a. gravitational compression b. biochemical cycling c. radiogenic heating 3.) a, gravity b. magnetic field c. heat energy for plato