Vivian visits the public aquarium in her city. While looking at the fish tank, she notices apple snails stuck to the glass wall of the tank. She feels nostalgic because she remembers collecting apple snails with her brothers when they were younger. Later, she was asked to recall what kind of sea creatures she had seen at the aquarium. She would be likely to remember having seen apple snails because she had engaged in processing to encode the information about apple snails.
A. less; shallow
B. less; intermediate
C. more; intermediate
D. more; deep

21 balloons is the story of professor william sherman's travels.

in 1883, he set off from san francisco for a balloon ride over the pacific and was found a month later floating with 21 balloons in the atlantic ocean. this seemed an astounding feat and everyone wanted to know what had happened.    

professor sherman was loyal, however, and said he would tell his tale first to the western american explorers club in san francisco, of which he was a member. this built up suspense for several chapters before he began to tell of the wonders of his adventures and the amazing island of krakatoa, an island which had just been blown up by a volcano.  

the residents of krakatoa are all millionaires who live under a "gourmet government" of their own devising. we get to see all the incredible adventures that creative people with unlimited resources would create according to the author.