Asedimentary rock containing a fossilized sea shell had been found. what does this tell you about the area at the time the rock was formed? i need fast pl 99 points plss

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?