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Chapter 8
Water and Oceans
22
Science
4th Grade
08/21/2012

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Cards

Term
A source of food for many ocean animals
Definition
plankton
Term
Almost _____ of the earth is covered with water
Definition
3/4 three-fourths
Term
Can affect the climate of land that they are near
Definition
surface currents
Term
Carries nutrients and minerals to the ocean
Definition
fresh water
Term
Contains mountains, valleys, and plains
Definition
the ocean floor
Term
Most waves are caused by ___
Definition
wind
Term
Regular changes in the water level of the ocean
Definition
tides
Term
Streams of water moving like rivers through the ocean
Definition
currents
Term
Temperature changes and the amount of salt in the water control the ____
Definition
deep ocean currents
Term
The cause of most waves and surface currents
Definition
wind
Term
The force that pulls fresh water toward the ocean
Definition
gravity
Term
The largest and deepest ocean
Definition
Pacific Ocean
Term
The path water takes as it travels between the earth and the air
Definition
the water cycle
Term
The size of waves can be determined by ___
Definition
the speed of the wind
Term
The smallest and shallowest ocean
Definition
Arctic Ocean
Term
The up-and-down movements on the surface of the water
Definition
waves
Term
Three ways the wind determines the size of waves:
Definition
1. by the wind's speed
2. by the distance the wind blows
3. by how long the wind blows
Term
Tides are caused by ___
Definition
the gravitational pulls of the sun and moon on the earth
Term
Tides happen in different places on earth because
Definition
the earth is rotating as the moon pulls on the water
Term
Tiny plants and animals that live on or near the surface of the ocean
Definition
plankton
Term
Two kinds of water
Definition
fresh and salt
Term
Waves are sometimes caused by underwater ____, ____, and ____.
Definition
earthquakes, volcanoes, and landslides
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