Ch 7, Lessons 4-6, 6th Grade Question Preview (ID: 60984)


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Ocean water has a ____ freezing point than fresh water.
a) lower
b) higher
c) the same
d)

The three temperature zones, from warmest to coldest, are
a) surface zone, transition zone, deep zone
b) deep zone, transition zone, surface zone
c) surface zone, deep zone, transition zone
d) transition zone, deep zone, surface zone

Sonar uses ___ to calculate the distance to an object.
a) sound waves
b) light
c) submersibles
d) electromagnetic waves

A broad area covered with thick layers of mud and silt
a) abyssal plain
b) continental slope
c) continental shelf
d) seamount

Stronger winds create
a) larger waves
b) smaller waves
c) slower waves
d) no waves

The lowest part of a wave is the
a) trough
b) crest
c) frequency
d) wavelength

In the open ocean, most waves are between
a) 2-5 meters high
b) 1-2 meters high
c) 7-10 meters high
d) 20 meters high

When waves pass, the particles
a) move in circles
b) get pushed towards shore
c) pile up on the bottom
d) do nothing

What causes waves to slow down as they reach shore?
a) friction between the ocean floor and the water
b) winds slowing down
c) the water's attraction to itself
d) the sand makes the water denser

There are warning systems for tsunamis.
a) true
b) false
c)
d)

THe movement of water and sand along a beach is called
a) longshore drift
b) rip current
c) undertow
d) barrier beaches

Where do rip currents form?
a) where water breaks through sandbars
b) in rocky areas below the surface
c) deep in the ocean trenches
d) all of the above

A wall of rocks or concrete that go outward from the beach
a) groin
b) barrier beach
c) sand dunes
d) longshore drift

Deep currents are caused by
a) differences in the density of ocean water
b) wind
c) earthquakes
d) all of the above

When surface waters in the eastern Pacific are colder than normal, a climate event called ___ occurs.
a) La Nina
b) El Nino
c) riptides
d) Gulf Stream

Warm ocean currents often bring ___ to the land.
a) warm, moist air
b) cold, dry air
c) warm, dry air
d) cold, moist air

In the Northern Hemisphere, the Coriolis effect causes the currents to curve
a) clockwise
b) counterclockwise
c) many different directions
d) straight down

Surface currents are driven mainly by
a) winds
b) differences in density
c) temperature differences
d) earthquakes

Salt is frozen in ice along with water.
a) false
b) true
c)
d)

Which is more dense: cold water or warm water?
a) cold water
b) warm water
c) they are equal
d) it depends on the salinity

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