Dr. alley is pointing to a brownish zone exposed in the low bluff along coast guard beach, cape cod national seashore. the brown zone is rounded on the bottom, flat on the top, rests on sand and gravel, and has sand dunes on top. in the lower picture, dr. alley is showing that the brown zone contains twigs and other organic material. what is the brown zone doing here? a) a sinkhole opened here, forming a lake that was then filled with organic material. b) an ice block from the glacier was buried in sand and gravel, then melted to make a lake. c) humans dammed a nearby river, forming a lake that then filled with organic material. d) the brown zone is mostly the carcass of a dead whale, which washed up on the beach. e) the brown zone is mostly the carcass of a dead whale, which was propelled here when that filled with organic material. was buried. highway-department workers dynamited it to get it off the beach.