Why are extreme tidal currents often observed at fjord outlets?
a. they are caused by eskers that accelerate tidal forces.
b. they are caused by alluvial fans that disperse sediments.
c. they are caused by moraines that restrict flow at the outlets.
d. they are caused by aretes that accelerate flow at the outlets.

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?