Unit 7- Pressure, buoyance, light and sound

Which of the following statements best describes buoyancy in the ocean?

• An object will float if its density is equal to the density of water

• An object will float if its density is less than the density of the water

• An object will sink if its density is greater than the density of the water

• 
  An object will float if its density is greater than the density of the water

Which of the following factors have a direct impact on the pressure in the ocean?

• weight of the water above it

• Salinity of the water

• Temperature of the water

• Density of the water

Which of the following is the fastest medium for sound to travel in?

• Solid

• Air

• Water

• Vacuum

How does the pressure change as you go deeper into the ocean?

• It decreases

• It increases

• It remains constant

• It fluctuates

What is the primary factor that determines the color of the ocean?

• Density of the water

• Temperature of the water

• Absorption and scattering of light

• Salinity of the water

What are the two major factors that affect the density of seawater?

• color & Pressure

• Temperature & Salinity

• Temperature & Pressure

• Pressure & Color

Which of the following factors affects the speed of sound in seawater?

• 
  Density and salinity

• Pressure and density

• Temperature and pressure

• Depth and color

Which of the following is true about light in the ocean compared to light in air?

• Light travels faster in water than in air

• Light travels at the same speed in water and air

• Light cannot travel in water

• Light travels farther in air than water

What causes pressure?

• buoyancy

• salinity

• density

• 
  the weight of the water above

What is the unit used to measure pressure in the ocean?

• pounds

• degrees

• bars

• liters