Tag: earthquake and volcanoes

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Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

There are annually 8,000-10,000 earthquakes in the world, which comes to about an earthquake every hour known as, ____________.

  1. Earthquake velocity

  2. Earthquake frequency

  3. Earthquake wave

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There are annually 8,000 - 10,000 earthquakes in the world, which comes to about an earthquake every hour. And there are many more that go undetected because there are no stations to record them over the oceans covering a very large surface of our earth. This is known as the Earthquake Frequency

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

A line connecting all points on the surface of the earth where the intensity of shock produced by earthquake waves is the same.

  1. Isosismic line

  2. Isohyte lines

  3. Isobars

  4. Isotherm lines
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Isoseismic Line is the line connecting all points on the surface of the earth where the intensity is the same. These lines show great irregularity in their form. 

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

Find the odd one out and give explanation for your choice.

  1. Tectonics

  2. Centrifugal Force

  3. Solar energy

  4. Precipitation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Tectonics is a geological process involving the Earth's crust, whereas centrifugal force, solar energy, and precipitation are atmospheric or physical forces related to weather and climate.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The most destructive earthquake waves are ___________.

  1. primary waves

  2. secondary waves

  3. surface waves

  4. all of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During an earthquake, surface waves are the seismic waves that cause the most damage. Unlike other seismic waves that move deep inside the Earth, surface waves move along just under the surface of the Earth like waves in water. Surface waves are the slowest seismic waves and are the final waves to hit an area after an earthquake. First, P-waves move through compression through the deep layers of the Earth. They result in minimal damage. The second group of waves is S-waves. They move up and down starting deeper in the Earth. Stronger S-waves do some damage when they reach the surface. Surface waves move in last. Their slow roll just under the surface provides the greatest risk for damage to man-made structures and changes to natural landforms

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

An earthquake produces which kind of sound before the main shock wave begins?

  1. Ultrasound

  2. Infrasound

  3. Audible sound

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earthquake is a movement of tremor of the earth's crust. It originated naturally and below the surface. An earthquake produces infrasound before the mainshock wave begins. Infrasound is low-frequency sound less than 20hz. It can travel hundreds of km through the earth's surface. So by detecting this sound, we can predict an earthquake.

Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The movement of the earth's plates causes __________.

  1. Cyclones

  2. Lightning

  3. Earthquakes

  4. Thunderstorms
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • Earth's crust is divided into various plates which float on hot magma layer called asthenosphere. When these plates move, they interact with each other which releases energy, that is felt on the surface of earth as tremors or shaking movement, which is termed as earthquake.
  • Cyclones, thunderstorms and lightenings are the atmospheric phenomena and are not related with earth's surface, hence these 3 options are incorrect.
Multiple choice geography our changing earth earthquake and volcanoes earthquake earthquakes

The point on the earth's surface directly above the point of origin of earthquake is called ___________.

  1. Crust

  2. Vibration

  3. Epicentre

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An earthquake  is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves.

An earthquake's point of initial rupture is called its focus or hypocenter. The epicenter is the point at ground level directly above the hypocenter