141.
A ..............is the interval from one noon to the next noon.
A
lunar day
B
day
C
mean solar day
D
solar day
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A ..............is the interval from one noon to the next noon.
lunar day
day
mean solar day
solar day
..............is needed for the experimental verification of various theories.
Instrument
Measurement
Unit
Symbol
Which statement below is not true?
Tsunami waves are different from ordinary waves that you see at the beach.
Tsunami waves ave a lot of energy and travel much further than ordinary waves.
Small tsunami waves are not dangerous
Not all earthquakes will generate a tsunami
Which of the following events do not cause atsunami?
Underwater or coastal earthquake
Large coastal cliff or lakeside landslides
Underwater volcanic eruptions
A plane crash into the ocean.
Which island in Western Samoa suffered the most damage when the tsunami struck on 29 September 2009?
Apia
Upolu
Savaii
Stewart Island
Where did the Good Friday earthquake occur?
Chile
Sumatra
California
Alaska
What is the magnitude of the largest earthquake recorded by man?
9
9.2
9.3
9.5
What does the word tsunami mean?
Big wave
Earthquake wave
Harbour wave
Tidal wave
What do tsunami look like in the open sea?
Hardly noticeable waves
Small cresting waves
Huge cresting waves
Huge non-cresting waves
Tsunamis are known for their capacity to:
Violently flood coastlines
Cause devastating property damage
Cause injury and loss of life
All of the above
Tsunami can occur:
Only in the morning
Only in the evening
Any time of the day or night
Only in the summer months
The wave height of a tsunami is typically less than
0.1 m
0.2 m
1 m
0.5 m
Most major tsunamis are produced by earthquakes with magnitudes greater than
6
7
8
9
Most major tsunamis are produced by earthquakes with hypo centers less than
5 km
10 km
20 km
30 km
Most major tsunamis are generated by earthquakes along
Divergent margins
Convergent margins
Transform margins
None of the above
Just prior to a tsunami coming ashore, sea level appears to fall quickly. This phenomenon is called
Sea level drop
Draw fall
Drawdown
Dip in sea level
In what year did the Boxing Day tsunami occur in the Indian Ocean?
1999
2004
2010
2007
In the open ocean a tsunami can travel at speeds of
50 m/hour
100 m/hour
966 km/hour
20 m/hour
If the seafloor is suddenly displaced upward, then what happens to the sea surface?
It will subside
It will remain unchanged
It will momentarily rise
None of the above
If the average depth of the oceans is 3500 meters, then what would the speed of a tsunami be in such open ocean conditions?
300 km/hour
400 km/hour
667 km/hour
500 km/hour