Can be felt only a little
Explanation
The Richter Scale is a logarithmic scale used to measure the magnitude (energy released) of an earthquake. The effects of an earthquake vary significantly based on this magnitude, ranging from imperceptible tremors to catastrophic destruction.
Analysis of Options:
- Can cause damage from things falling is Incorrect: Damage from falling objects, such as plaster or chimneys, typically occurs during earthquakes with a magnitude of 5.0 or higher. A magnitude of 2.0 is too weak to cause structural shaking or damage.
- Is considered very strong is Incorrect: An earthquake is considered "strong" generally when the magnitude exceeds 6.0. A magnitude of 2.0 is classified as a micro-earthquake.
- Can be felt only a little is Correct: Earthquakes with a magnitude of 2.0 or less are classified as micro-earthquakes. They are usually not felt by people and are only recorded by seismographs. However, in the context of the given options, this is the only choice that correctly identifies the event as having negligible or minimal perceptibility compared to the destructive descriptions in other options.
- Is classified as a major earthquake is Incorrect: A "major" earthquake is typically defined as having a magnitude between 7.0 and 7.9, capable of causing widespread heavy damage.
Key Takeaway:
Magnitude 2.0 or less indicates a micro-earthquake, which is generally imperceptible to humans and detected only by instruments, whereas damage usually begins at magnitudes above 5.0.