Tides

tidal range

The difference in levels of ocean water at high tide and low tide.

How often do tides rise and fall? a. once a day c. every 14 days b. twice a day d. every 24 h, 50 m

b. twice a day

On what type of coast would a tidal bore most likely occur?

A tidal bore would most likely occur along a coast that has narrow bays, inlets and river channels.

What is a tidal bulge?

A tidal bulge is a bulge in the Earth's oceans on the side of the Earth closest to and farthest from the moon.

spring tide

A tide with the greatest difference between high and low tide that occurs when the sun and the moon are aligned with Earth at the new moon and full moon.

neap tide

A tide with the least difference between low and high tide that occurs when the sun and moon pull at right angles to each other at the first and third quarters of the moon.

What is a neap tide and when would a neap tide occur?

During a neap tide, there is the LEAST difference between high and low tides. Neap tides occur during the first and third quarters of the moon.

What is a spring tide and when would a spring tide occur?

During a spring tide, the GREATEST differences between the tides occur. Spring tides occur during new and full moons.

Explain how the positions of the Earth, moon, and sun affect the tides.

During spring tides, the gravity of the sun and moon pull on the Earth from either the same direction or from opposite directions, producing higher tidal ranges. During neap tides, the sun and moon are at right angles with respect to Earth. This lessens their pull on Earth, producing lower tidal ranges.

Which of these takes exactly 24 h? a. one rotation of the Earth b. one revolution of the moon around the Earth c. one period between two high tides d. one period between two full moons

a. one rotation of the Earth

When do the greatest tidal ranges occur? a. spring tides c. high tides b. neap tides d. low tides

a. spring tides

From what is known about spring tides and neap tides, you can conclude that a. the sun's gravity exerts the most power when the moon is on the opposite side of the Earth from the sun. b. the height of high tides varies with the moon. c. spring tides and neap tides affect the phases of the moon. d. the moon revolves around the Earth every 14 days.

b. the height of the tides varies with the moon.

Which statement describes what is happening at high tide? a. The moon is revolving more quickly than the Earth is rotating. b. The moon's gravity is dragging water away from the equator. c. The moon's gravity is pulling ocean water into a bulge. d. The sun's gravity pulls with more force than the moon's gravity.

c. The moon's gravity is pulling ocean water into a bulge.

An unusually high tide is called a ____________ tide. a. major c. neap b. tall d. spring

d. spring

bulge that takes place on parts of Earth facing or opposite the moon

high tide

forms when water is drawn away from the area between high tides

low tide

The most important force that creates tides is the gravity of the ____________.

moon

tides that occur during the first and third quarters of the moon

neap tide

A narrow inlet of land along a coast is where you might see a ___________________. This causes a very sudden rise in the tide.

tidal bore

The difference between levels of ocean water at high tide and low tide is called a(n) ________________.

tidal range

the difference between water levels at low and high tide

tidal range

Neap, spring, high, and low are all types of _________________.

tides

On what kind of coast line would you predict the largest tidal ranges to occur?

The largest tidal ranges should occur along coastlines that have a long narrow inlet or even a basin formed where a river flows into the ocean.

tide

The periodic rise and fall of the oceans and other large bodies of water.