Unit 4 Flashcards
The _____ is the largest ocean.
Pacific
The distance between two matching points on a wave is the _________.
wavelength
The periodic and predictable rise and fall of water is a _______.
tide
75% of the ocean’s floor is found in the ________ zone.
abyssopelagic
The layer of water that has a sharp decrease in temperature and forms a barrier between the warm surface water and the cold deeper water is the _________.
thermocline
________ tides consist of two high and two low tides per day of unequal proportion.
mixed
currents caused by waves breaking at an angle along the shore are _______ currents.
longshore
the ____ is defined as a body of saltwater that covers 70% of the earth’s surface.
ocean
the _______ of earth’s plates is called plate tectonics.
movement
________ currents are caused when surface water is blown away by the wind and deeper water rises to replace it.
upwelling
______ are spiral ocean currents caused by global wind patterns.
gyres
________ is the process at convergent plate boundaries where the old crust disappears into trenches as new crust is formed.
subduction
crust is destroyed at ________ boundaries.
convergent
large waves that are caused by earthquakes or disturbances on the ocean floor are called _______.
tsunami
______ means of or relating to the shore
littoral
The _______ ocean has currents that change direction twice a year.
Indian
The highest point of a wave is the ______.
crest
_________ tides consist of two high tides and two low tides of equal strength.
semidiurnal
longshore currents cause the formation of ________ islands.
barrier
the gradual movement of continents over time is _______________.
continental drift
the term __________ describes the movement of the ocean.
water current
part of an ocean that is partially encircled by land is a ______.
sea
the continents are thought to have been all part of a supercontinent called ________.
pangea
most waves are caused by the _______.
wind
_______ is of or relating to the open ocean.
pelagic
the Hawaiian islands were formed over a _______.
hotspot
no crust is destroyed or produced at ___________ boundaries.
transform
new crust is generated at __________ plate boundaries.
divergent
an old volcano whose summit was cut off due to erosion and submerged underwater is a _______.
guyot
the distance between the crest and trough is the ________.
wave height
waves are not the movement of water but rather the movement of _______.
energy
_________ tides consist of one high and one low tide each day.
diurnal
the ________ zone receives the most amount of sunlight.
epipelagic
the global conveyor belt currents is a slow-moving, deep water current that is formed based on _______ differences.
density
the mid ocean ridge refers to ______.
- an underwater mountain chain
-ridges that are formed by magma at divergent plate boundaries
what is true about hydrothermal vents?
-they are chimney-like structures on the ocean floor
-they are formed when two plates pull away from each other at divergent boundaries and erupting magma from the earth’s crust creates new ocean floor.
a seamount refers to _____.
- volcanic mountain that has a pointed summit
-an isolated mountain formed from a volcano
the speed of sound travels faster in higher or lower temperatures?
higher temperatures
what causes tides?
gravitational forces from the moon and sometimes the sun.
what percent of the world’s population can be found in coastal areas?
half
