During the summer, vacationers increase the population from about 200,000 to more than 500,000. Sandy Neck dune bog, Cape Cod. A bog is a wet spongy area that consists of decaying vegetation. Leaking landfills in towns on Cape Cod contain everything from pesticides to household waste. These landfills have been contaminating Cape Cod's groundwater for decades.
Mangrove trees drop their roots from their trunks and branches into mud.
Thus the mangrove helpls protect shorelines from erosion and helps build new land. In the Everglades, mangroves are threatened by cattails that thrive on water polluted by agricultural runoff. Today, water that once sustained the Everglades in controlled through hundreds of miles of canals and levees. Other animals use these holes, which often fill with water, to sustain themselves during dry spells. Soaring peaks, sunny climate, and the California culture make Los Angeles one of the Nation's most popular places to live.