Why do beaches have different material onshore?

What does deltas cause? What are some tourist attractions in a tropical rainforest? The longest south American river is also the worlds largest waterway. what is the water way? Where is California in the southern part or the northern part? How big is a deciduous forest? What are advantages of ocean currents? How do the Appalachian plateau make its money? What was the name of the god of the nile river? What is the dominant animal species in wetlands? What plate do you have on the ocean floor south of Alaska? Dissolved silt makes the what look yellow? How much you pay for littering in a lake? What philosophy meant that the US was set apar to extend its boundaries all the way to the pacific? Which one of the stats shares its name with one of the great lakes? Where in Florida would sand dunes most likely form? What are two cities near Mission San Miguel arcangel? How do coral reefs offer opportunities for human activity? What are the hours of the Guggenheim Museum in New York City? Was Ellis island hard to enter? Which river lies at the base of the grand canyon?