Vietnam: What are the sample expositive essays on the natural phenomenon - Tsunamis? What is the time allocated for the speaking and listening content in the 6th-grade Language curriculum?

Sample expositive essays on the natural phenomenon - Tsunamis
 

Sample 1: Tsunamis – The Devastating Power of Nature

Tsunamis, a powerful natural phenomenon, is always a haunting fear for coastal areas. Causing millions to suffer severe consequences, tsunamis not only result in material damage but also claim countless lives.

Tsunamis form when a large amount of seawater is suddenly displaced due to geological activities beneath the ocean such as earthquakes, volcanic eruptions, or underwater landslides. When a tsunami forms, it moves at very high speeds, reaching up to hundreds of km/h. In the deep ocean, tsunamis often have modest heights, but as they approach shallow waters, they concentrate and rise suddenly, forming massive walls of water that sweep away everything in their path.

The destructive force of tsunamis is truly terrifying. They not only cause waves tens of meters high but also create swift currents that sweep away houses, boats, and other objects. The land is eroded and polluted, leading to long-term consequences for the environment and economy.

Sample 2: Causes and Characteristics of Tsunamis

To better understand tsunamis, we need to explore their causes and notable characteristics.

As mentioned above, earthquakes are the primary cause of tsunamis. When an earthquake occurs beneath the ocean floor, tectonic plates shift suddenly, pushing a large amount of seawater upward, forming a tsunami. Additionally, underwater volcanic activities, landslides, or even impacts from large meteorites can also cause tsunamis.

A prominent feature of tsunamis is their rapid movement. In deep oceans, tsunamis can travel at speeds up to 800 km/h. However, as they move into shallow waters, their speed decreases but their height increases significantly.

Sample 3: Regions Prone to Tsunamis and Preventive Measures

Not all oceanic regions are at risk of tsunamis. Areas close to regions with significant geological activity like the Pacific Ring of Fire and the Mediterranean are high-risk areas for tsunamis.

To minimize damage caused by tsunamis, establishing early warning systems and raising community awareness is crucial. When there are tsunami warning signs, residents need to quickly move to higher ground, away from coastal areas.

Sample 4: Tsunamis and Lessons Learned

History has witnessed many horrific tsunamis that caused severe damage to people and property. From these disasters, humanity has drawn many valuable lessons.

Building protective structures such as sea dykes and breakwaters is one of the effective measures to mitigate the impact of tsunamis. In addition, researching and forecasting tsunamis is an urgent issue.

Sample 5: The Importance of Researching and Responding to Tsunamis

Tsunamis are a complex and unpredictable natural phenomenon. Researching and responding to tsunamis not only helps reduce damage but also contributes to protecting lives and property.

Scientists worldwide are constantly researching to find more accurate tsunami forecasting methods. Additionally, international cooperation in sharing information and mutual support in disaster prevention is also very important.