Sand is supplied to the california coastal region primarily by:
• (a)coastal erosion •
• (b)local biological activity •
• (c)rivers that flow from the sierra-nevada mountains
•(d)ocean floor upwelling

What is the difference between the cultures of central asia and the caucasus region? the majority of people in central asia are muslim; the majority in the caucasus region are christian. the primary language in central asia is armenian; the primary language in the caucasus region is russian. central asia has been plagued by ethnic unrest; the caucasus region has had little ethnic conflict. the effects of soviet rule can still be seen in central asia; the caucasus region has developed its own identity since the fall of the ussr.

Plzz on what physical process is responsible for the creation of volcanoes, earthquakes and ocean trenches at the plate margins?

Which layer surrounds the center of the earth? a: crust b: core c: mantle