swirling current of water, air, etc. is...

The controlling surface that regulates an aircraft's pitch is...

agitated is...

rough irregular cuts is...

never stopping, going on all the time is...

arising from a natural impulse; spontaneous and unthinking is....

distinct, strong, clearly indicated is....

pins or bolts of steel that hold metal plates together is...

causing sorrow or pity is...

consistently dependable is...

blocked is...

nearly, almost is...

To form a mental image of; imagine is...