Earth science needed which of the following lists earth's compositional layers starting with earth's center and ending with the outermost layer? a. crust, core, mantle b. mantle, crust, core c. crust, mantle, core d. core, mantle, crust

Afisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. it takes a time of 2.70 s for the boat to travel from its highest point to its lowest, a total distance of 0.700 m. the fisherman sees that the wave crests are spaced a horizontal distance of 6.50 m apart. a. how fast are the waves traveling? b. what is the amplitude a of each wave?