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كويز تفاعلي: Earthquake Risks
Understanding earthquake risks is essential for geosciences and safety. This assessment covers the fundamental causes of seismic activity, focusing on plate boundary stress and the distinction between earthquake magnitude and intensity. It examines the scales used by scientists, such as the Moment Magnitude and Modified Mercalli scales, and evaluates specific hazards like soil liquefaction, structural pancaking, and the generation of tsunamis through vertical seafloor displacement.
يرجى الانتباه إلى أن الإجابات أو الشروحات قد لا تكون دقيقة دائمًا، لذلك يُفضّل مراجعتها مع المعلم أو المصدر الدراسي المعتمد. وبعد آخر سؤال ستظهر الدرجة النهائية تلقائيًا.
What is the primary cause of an earthquake?
A
The build-up and sudden release of stress along plate boundaries
B
The cooling of Earth's core
C
High-pressure weather systems pushing on the crust
D
Gradual erosion of surface rocks by water
Explanation
Earthquakes are primarily caused by the sudden release of accumulated energy (stress) when rocks along a fault or plate boundary break.
a magnitude 8 earthquake produces how much more ground motion (shaking) than a magnitude 7 earthquake?
A
2 times more
B
32 times more
C
10 times more
D
100 times more
Explanation
On the magnitude scale, each whole-number increase represents a ten-fold increase in the measured amplitude or ground shaking.
Which scale measures an earthquake's intensity based on the actual effects on people and the damage to structures?
A
Richter magnitude scale
B
Moment magnitude scale
C
Modified Mercalli scale
D
Seismic wave scale
Explanation
The Modified Mercalli scale measures intensity, which is a qualitative assessment of the earthquake's effects on the environment and infrastructure.
What occurs during the phenomenon known as liquefaction?
A
Solid rock melts into magma due to friction
B
Wet soil behaves like a liquid, causing buildings to sink
C
Tsunami waves wash away coastal soil
D
Rocks stretch and bend without breaking
Explanation
Liquefaction occurs when seismic shaking causes water-saturated sediment to lose strength and act like a fluid.
A "fault" is best described as:
A
The point directly above the earthquake on the surface
B
The total energy released by a seismic wave
C
A break in Earth's crust along which movement occurs
D
The measurement of damage in a populated area
Explanation
A fault is a fracture or zone of fractures in the Earth's crust where blocks of rock have moved relative to each other.
What does the "Moment Magnitude Scale" take into account to provide more accurate measurements?
A
Only the height of the lines on a seismograph
B
The size of the fault, the motion along it, and rock strength
C
The amount of rainfall and soil moisture
D
The number of people evacuated from the area
Explanation
Unlike the Richter scale, the Moment Magnitude Scale calculates the total energy based on physical factors like fault area and rock rigidity.
The process of "pancaking" refers to which type of earthquake hazard?
A
Soil turning into a liquid-like state
B
Building floors collapsing onto one another like a stack
C
Coastal flooding from a large ocean wave
D
The rapid downhill movement of loose rocks
Explanation
Pancaking is a structural failure where the walls of a floor fail, causing the upper floors to collapse vertically onto the floors below.
Approximately how much more seismic energy is released by a magnitude 6 earthquake compared to a magnitude 5?
A
32 times
B
10 times
C
100 times
D
1,024 times
Explanation
While shaking increases 10-fold per magnitude unit, the energy released increases by a factor of approximately 32.
What is the primary cause of a tsunami?
A
Vertical motion of the seafloor during an earthquake
B
Strong winds during a storm at sea
C
The resonance of tall buildings near the coast
D
Rapid landslides in mountain ranges
Explanation
Tsunamis are most commonly caused by subduction zone earthquakes that vertically displace a large volume of water.
At what depth can earthquakes occur?
A
Only within the first 10 km of the surface
B
Anywhere between the surface and depths greater than 600 km
C
Only in the Earth's liquid outer core
D
Strictly at the bottom of the ocean floor
Explanation
Earthquakes can occur at various depths, classified as shallow, intermediate, or deep (up to ~700 km) within the lithosphere and upper mantle.
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