Understanding Earthquakes

An earthquake is the movement or shaking of the ground caused by sudden movements between rock masses in the Earth's crust. Stress and tension build up over time, and when they exceed the rock's strength, the rock breaks or moves along faults. This generates energy waves that travel outward, similar to ripples in water. While some earthquakes are imperceptible, others can cause significant property damage.

What is the primary cause of an earthquake?

• Wind erosion

• Volcanic eruptions

• Movement of tectonic plates

• Solar flares

What happens when stress exceeds the strength of rocks in the Earth's crust?

• The rocks expand

• The rocks break or move along faults

• The rocks melt

• The rocks become magnetic

How are the energy waves generated by an earthquake similar to ripples in water?

• They travel only downwards

• They travel only upwards

• They travel outward in all directions

• They travel in a straight line

What is a possible outcome of a powerful earthquake?

• Formation of new mountains

• Intense property damage

• Decrease in global temperature

• Increased rainfall

Can all earthquakes be felt by humans?

• No, some are too weak to be felt

• Only those near the ocean

• Yes, all earthquakes are felt

• Only those during the day