1.weathered materials from rocks and transported to the beach through wind and rivers
2.from rocks weathering and eroding over thousands and millions of years.
<span>The study of how traits are inherited though the interaction of alleles is defined as genetics and it began in the 1850's. Gregor Mendel was the first scientist to study genetics. </span>
Things like food shortage, war destruction, and weapons.
As in 2009, there are approximately 20,000 cities or metropolitan areas in the United States.