12 Questions
What is the sudden shaking or movement of the Earth's crust called?
Earthquake
What is the spot directly above the focus called?
Epicenter
What is referred to as a break on the earth's crust along which significant movement has taken place?
Fault
What triggers the movement of a fault?
Pull of the moon upon earth
Where would the shaking most likely be greater when an earthquake occurs?
At the epicenter
Which scale measures an earthquake's intensity based on the observed effects on people and structures?
Modified Mercalli Scale
What measures an earthquake's intensity based on the observed effects on people and structures?
Modified Mercalli Scale
Which statement BEST describes the state of earthquake prediction?
Scientists can characterize the seismic risk of an area, but cannot yet accurately predict most earthquakes.
What government agency is tasked to identify the intensity of earthquakes in the Philippines?
PHIVOLCS
Why is the Philippines prone to earthquakes?
Ring of Fire
What is the bending of light when it travels from one medium to another of different optical densities called?
refraction
In the colors of light, which color is the least bent?
Red
Study Notes
Earthquakes
- The sudden shaking or movement of the Earth's crust is called an earthquake.
- The spot directly above the focus of an earthquake is called the epicenter.
- A break on the Earth's crust along which significant movement has taken place is referred to as a fault.
- The movement of a fault is triggered by the buildup of stress in the Earth's crust.
Earthquake Measurement
- The shaking is most likely to be greater near the epicenter when an earthquake occurs.
- The Mercalli scale measures an earthquake's intensity based on the observed effects on people and structures.
- The intensity of an earthquake is measured by the effects it produces, such as the amount of damage caused to structures and the environment.
Earthquake Prediction
- The state of earthquake prediction is that it is still not possible to accurately predict when and where an earthquake will occur.
Philippines and Earthquakes
- The Philippine Institute of Volcanology and Seismology (PHIVOLCS) is the government agency tasked to identify the intensity of earthquakes in the Philippines.
- The Philippines is prone to earthquakes due to its location in the Pacific Ring of Fire, where several tectonic plates meet and interact.
Light Refraction
- The bending of light when it travels from one medium to another of different optical densities is called refraction.
- The color of light that is least bent is red.
Test your knowledge of earthquakes and faults with this Grade 8 2nd quarter reviewer. Identify key concepts related to fault types, earthquake features, and geological terms.
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