Earth Science Spring 2025 Final

About what percentage of Earth's surface is covered by water?

• 45%
• 51%
• 71%
• 85%

Which of the following forms at mid-ocean ridges?

• Island arcs
• Deep-sea trenches
• Guyots
• New ocean floor

The three types of ocean floor sediments are classified according to their

• color.
• origin.
• particle size.
• hardness.

What are the two major energy sources obtained from the ocean floor?

• Oil and manganese
• Calcium carbonate and halite
• Natural gas and coal
• Oil and natural gas

Describe the transfer efficiency between trophic levels.

• Very inefficient, as little as 2%.
• Somewhat efficient, roughly 50%
• Very efficient, as high as 90%
• Perfectly efficient at 100%

Based on the information in the food web, what eats crayfish?

• Sea duck
• Phytoplankton
• Bivalve
• Zooplankton
• Bald eagle

Which of the following occurs when the ocean's salinity increases?

• Density increases.
• Density decreases.
• Temperature increases.
• Temperature decreases.

Most ocean waves get their energy from

• the sun.
• plate movement.
• the moon's gravity.
• the wind.

Energy moves through ocean waves in a(n)

• convection current.
• circular motion.
• oscillating motion.
• straight line.

Ocean tides results largely from the gravitational attraction of the

• sun.
• core of Earth.
• closest neighboring planets.
• moon.