Select three things sonar mapping tells scientists besides the depth of the water.
clarity of water
types of fish in water
texture of the sea floor
areas of volcanic activity
location of ridges and ledges
presence of coral or seaweed

Facial shaving brushes are either bulb-shaped or fan-shaped. an experiment is to be conducted to determine whether the lather thickness is the same for both types of shaving brushes. in previous studies, it was determined that shaving brush size (small, medium, large) is associated with lather thickness, but shaving brush type (wolf whiskers, maggard razors, frank shaving, and so on) is not associated with lather thickness. how could the experiment best be conducted? by blocking on shaving brush size by blocking on shaving brush type by blocking on shaving brush shape by blocking on lather thickness without blocking

What are the main functions of the human skeleton? a exchange of gases b support and movement c sensing the environment d digestion and excretion

The torque output of an engine is usually measured in the units of a rpm b bhp c foot pounds d feet per pound