About how much time passes between one high tide and the next consecutive low tide?

• 6 hours
• 12 hours
• 24 hours
• 2 days

How does the temperature of ocean water create deep currents?

• Warm water is more dense so it sinks, creating deep currents.
• Cold water is more dense so it sinks, creating deep currents.
• Cold water is less dense so it floats, creating surface currents.
• Warm water is less dense so it floats, creating surface currents.

What is the MAIN cause of Earth's tides?

• The moon's gravitational pull on Earth's waters.
• The sun's gravitational pull on Earth's waters.
• Wind blowing across the ocean's surface.
• The differences in densities of ocean water.

When the sun and moon are at right angles (90⁰) to each other, Earth experiences which type of tide?

• neap tide
• low tide
• high tide
• spring tide

What is the main cause for the formation of surface currents AND waves in the ocean?

• The moon's gravitational pull on Earth's waters
• The wind blowing across Earth's surface.
• Strong earthquakes and underwater landslides
• The differences in ocean water's densities

Which ocean borders North and South America, Africa, and Europe?

• Atlantic

• Indian

• Southern

• Pacific

What do waves and surface currents have in common?

• They both curve clockwise due to Earth's rotation.
• They are formed when the wind's energy is transferred to the ocean's surface.
• They are created when cold, salty water sinks.
• They both influence the climate of coastal regions.

About how many hours pass between each low tide?

• 24 hours
• 18 hours
• 12 hours
• 6 hours

What factor can decrease the salinity of ocean water?

• evaporation from the surface of the ocean
• the freezing of ocean water
• increased condensation to form clouds
• being at the mouth of a river

How does the salinity of the Dead Sea affect its density?

• Dead Sea water is more dense because of its high salinity.
• Dead Sea water is less dense because of its high salinity.
• Dead Sea water is more dense because of its low salinity.
• Dead Sea water is less dense because of its low salinity.