The bystander effect refers to the finding that an observer of an emergency is less likely to help if the:

if you are on the computer you can not take a picture but you can upload one but i am not sure about phones but i'm pretty sure it's the but to upload one just click the paper clip looking thing/ link thingy thing and upload a pic

a. the moon was locked into orbit by the earths gravity as it was passing by and capture hypothesis i think

i believe your answer is mountains.