_____ currents flow from east to west and west to east linking the eastern and western boundary currents. 

The greatest amount of heat transfer through ocean currents occurs at _____. 

A _____ forms when a sand spit closes off a bay by attaching to a headland adjacent to the bay. 

The orbits of water molecules in waves moving through _____ water are flattened by the proximity of the bottom. 

_____ is the number of waves passing a fixed point per second. 

A _____ is an accumulation of sediment that runs parallel to shore and marks the normal limit of sand deposition by wave action. 

Gravity tends to pull Earth and the moon toward each other, but inertia, sometimes called _____, keeps them apart.  

Water from waves washing onto a beach, called the _____, carries particles onshore and increases the beach’s slope. 

Marine erosion is usually most rapid on _____ coasts. 

One of the first persons to classify groups of organisms into natural categories was the 18th-century naturalist _____.