Which of the following has not played a major role in forming the grand canyon? a. erosionb. marine animalsc. the colorado riverd. deposition of sediment

:calculate the sum of the interior angles of a 13-sided polygon.

What two advantages do the coastal countries of west africa have over the sahel countriesfertile soil and mineral resources temperatures and terrain human resources and natural resources weather patterns and location

Soil is made of air water organic material minerals weathered rock