The "seiche" or shallow pool of Lake Ontario sloshes back and forth across the length of the lake in about 6 hours, changing the local height of the surface by a few centimeters up and down. Ontario is about 86 meters in average depth and is 311 km long. Lake Erie to its west also has a seiche pattern, but lake Erie is shallower with an average depth of 19 meters, and slightly longer at 388 km. About what would you expect the period of the oscillation of water level in Lake Erie to be, and based on what physics?

The "seiche" or shallow pool of Lake Ontario sloshes back and forth across the length of the lake in about 6 hours, changing the local height of the surface by a few centimeters up and down. Ontario is about 86 meters in average depth and is 311 km long. Lake Erie to its west also has a seiche pattern, but lake Erie is shallower with an average depth of 19 meters, and slightly longer at 388 km. About what would you expect the period of the oscillation of water level in Lake Erie to be, and based on what physics?

		16 hours because the Erie is longer and shallower
		27 hours because Lake Erie is shallower
		about 8 hours because Lake Erie is longer
		the same, about 6 hours because it depends on the water properties and not the geometry