Identify the theme: As soon as the team walks in, the gym falls completely silent. The entire tribe turns its back on Junior—all except for Rowdy, who simply looks like he wants to kill him. Both angered and impressed by the show of contempt, Junior thinks that he might not have left if his tribe was this organized in other respects, a thought that makes him laugh.

Explanation:

At first the quote 'the gym falls completely silent' suggests that there is a tense situation but as it goes on to 'The entire tribe turns its back on Junior' suggests that they may be angry with Junior for some particular reason which then leaves the reader wanting to read on in the story to find out why the tribe has turned their back on Junior. But '- all except for Rowdy' which allows the writer to suggest that maybe he is still on Juniors side but then 'who simply looks like he wants to kill him' is giving us a weird vibe that they don't want Junior to be there

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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.