An echo sounder operates by measuring the time required for a .

What is the theme of "the story of the fisherman"?

What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

What is found within a ranger tower overlooking a drained lake