Name
Date
Directed Reading for
Content Mastery
Class
Overview
Ocean Motion
Directions: Use the following terms and descriptions to fill in the outline.
crest
Move water horizontally
High tide
trough
Covers 70 percent of Earth
Low tide
Are affected by the Coriolis effect
Tidal range
Form when a mass of seawater becomes more dense than the water around it
Meeting Individual Needs
I. Ocean water
A.
B. Contains many dissolved salts
II. Ocean currents
A. Surface currents
1.
2. Are powered by wind
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
B. Upwellings
C. Density currents
1. Water that circulates deep in the ocean
2.
III. Ocean waves and tides
A. Parts of a wave
1. The highest point of the wave, or the ________________________.
2. The lowest point of the wave, or the ________________________.
B. Tides
1. ________________________, when sea level appears to rise
2. ________________________, when sea level appears to drop
3. ________________________, the difference between the level of the
ocean at high tide and low tide
Ocean Motion
15
Name
Date
Directed Reading for
Content Mastery
Section 1
Section 2
■
■
Class
Ocean Water
Ocean Currents
Directions: Use the terms to complete the paragraphs below them.
salts
sodium chloride
rivers
salinity
basins
Billions of years ago, low areas on Earth called 1. ____________________ filled
with water to form oceans. In addition to water, oceans contain dissolved
that empty into the ocean. The measure of the amount of salt in seawater is called
4. ____________________. The most common salt in ocean water
is 5. ____________________.
Coriolis effect
rotation
current
warm
upwelling
surface
density
Ocean water is always moving. The mass movement or flow of ocean water is
called a 6. ____________________. Currents caused by wind that moves water
parallel to Earth’s surface are called 7. ____________________ currents. The
direction of currents is influenced by the 8. ____________________, which is
caused by the 9. ____________________ of Earth. Other currents, called
10. ____________________ currents, occur because warm seawater is less dense
than cold seawater. This means the 11. ____________________ water rises, and the
cold water sinks and travels along the ocean bottom. Areas of
12. ____________________ occur when circulation in the ocean brings deep, cold
water to the ocean surface.
16 Ocean Motion
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
Meeting Individual Needs
2. ____________________. Many of them come from 3. ____________________
Name
Date
Directed Reading for
Content Mastery
Section 3
Class
■
Ocean Waves and Tides
Directions: Study the following diagram. Then label the waves using the correct terms from the list.
wave height
Direction of wave
wavelength
1.
trough
2.
Meeting Individual Needs
crest
4.
3.
Directions: Circle the term that correctly completes the sentence.
5. For the most part, the Moon’s gravity causes (tides/wind).
6. Water waves are caused by (crests/wind).
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
7. Friction with the ocean bottom causes water at the bottom of the wave to
(slow down/speed up).
8. High tides are higher than normal when there are (neap tides/spring tides).
Directions: Label each figure below as conditions either for a spring tide or a neap tide.
Sun
Sun
New
moon
Earth
Earth
1st
quarter
moon
9.
10.
Ocean Motion
17
Name
Date
Directed Reading for
Content Mastery
Class
Key Terms
Ocean Motion
Directions: Use the clues below to complete the crossword puzzle.
1
3
2
4
5
6
7
9
10
Across
1. The lowest point of a wave
7. Mass movements, or flows, that move water horizontally
8. The difference between the levels at high tide and low tide is the ______ range.
9. Low area in which oceans formed
10. A rise and fall in sea level
Down
2. Circulation in the ocean that brings deep, cold water to the surface
3. The highest point of a wave
4. When denser seawater sinks under less dense seawater, a ______ current is
formed.
5. Rhythmic movement that carries energy from one place to another
6. A collapsing wave
7. Measure of the salts dissolved in seawater
18 Ocean Motion
Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc.
Meeting Individual Needs
8