Cuestionario: Earth's Dynamic Geology — 8 preguntas

1. In what year did Giuseppe Mercalli develop the scale used to measure earthquake intensity based on observed effects?

A. 1920

B. 1910

C. 1902

D. 1890

Answer: (C)

Explicación

Giuseppe Mercalli developed the Mercalli scale in 1902 to measure earthquake intensity based on observed effects and damage, making this the correct answer.

2. When was the scientific classification of volcanoes into shield and composite types most widely established?

A. In the mid-20th century

B. In the 18th century

C. In the late 19th century

D. In the early 20th century

Answer: (D)

Explicación

The classification of volcanoes into shield and composite types became widely recognized in scientific literature during the early 20th century, around 1910, as geologists studied eruption styles and volcano shapes to categorize different volcano types.

3. What are some of the major effects or consequences of volcanic eruptions?

A. Enhanced agricultural productivity due to volcanic ash fertilization

B. Increase in global temperatures due to ash particles in the atmosphere

C. Immediate cooling of the Earth's surface leading to a mini ice age

D. Long-term social disruption and economic costs such as rebuilding infrastructure and loss of tourism

Answer: (D)

Explicación

The correct answer is that volcanic eruptions can cause long-term social disruption and economic costs, including damage to infrastructure, homelessness, and a decline in tourism. These impacts are explicitly mentioned as consequences of volcanic activity. The other options are either not supported by the content or are misconceptions; for example, volcanic ash can temporarily cool the climate, but the question focuses on broader effects, and increased temperatures or enhanced productivity are not the primary consequences discussed.

4. How can communities living near volcanoes best apply their knowledge of volcanic hazards to ensure safety?

A. Reduce monitoring of volcanic activity to save costs

B. Build more houses close to the volcano for economic benefits

C. Implement early warning systems and evacuation plans

D. Ignore volcanic activity and continue normal activities

Answer: (C)

Explicación

Implementing early warning systems and evacuation plans allows communities to respond promptly to volcanic eruptions, reducing risk and saving lives. The other options are either impractical or increase danger.

5. What is the primary role of convection currents in the Earth's mantle?

A. To cause volcanic eruptions directly

B. To cool the Earth's core

C. To form the Earth's crust

D. To drive the movement of tectonic plates

Answer: (D)

Explicación

Convection currents in the mantle are responsible for driving the movement of tectonic plates, which causes phenomena such as earthquakes, volcanoes, and mountain formation. They do not directly cause eruptions, form the crust, or cool the Earth's core.

6. What is the Earth's inner core?

A. A solid ball composed mainly of iron and nickel

B. A layer of liquid magma beneath the mantle

C. The Earth's outermost crust made of rock and soil

D. A semi-molten layer that drives plate movements

Answer: (A)

Explicación

The Earth's inner core is a solid sphere primarily made of iron and nickel, remaining solid due to the immense pressure despite the high temperature.

7. How do the focus and the epicentre of an earthquake differ from each other?

A. The focus is the point inside Earth where the earthquake originates, while the epicentre is the point on Earth's surface directly above the focus.

B. The focus and the epicentre are the same point, just called by different names.

C. The focus is the point on Earth's surface directly above the earthquake's origin, while the epicentre is the origin point inside Earth.

D. The focus is the point where seismic waves are strongest, while the epicentre is where they are weakest.

Answer: (A)

Explicación

The focus is the point inside Earth where the earthquake begins, and the epicentre is the point on the surface directly above the focus. They are related but distinct; the focus is the origin of seismic energy, while the epicentre is the surface location most affected.

8. Who is credited with proposing the scale used to measure earthquake magnitude?

A. Giuseppe Mercalli

B. Andrija Mohorovičić

C. John Milne

D. Charles F. Richter

Answer: (D)

Explicación

Charles F. Richter is credited with proposing the Richter scale in 1935, which is used to measure the magnitude of earthquakes objectively. Giuseppe Mercalli developed a different scale based on observed effects, not magnitude.