The first response is the most accurate.
Both earthquakes and tsunamis are indeed caused by the movement of tectonic plates. Earthquakes result from the sudden release of energy in the Earth's crust, leading to shaking, which can cause significant damage to structures and landscapes. Tsunamis, on the other hand, are often generated by underwater earthquakes (as well as volcanic eruptions or landslides) and are characterized by large ocean waves that can travel across the ocean and cause destruction upon reaching coastal areas.
The other responses are incorrect or misleading. Specifically:
- Earthquakes can affect both coastal and inland areas, not just landlocked regions.
- Tsunamis can affect coastal areas, including islands, but they are not limited to them.
- Both earthquakes and tsunamis can significantly impact human populations, particularly in coastal regions.
Thus, the first response effectively captures the relationship and distinctions between earthquakes and tsunamis.