Monday, May 20, 2019

Explanation Text (Explanatory) : The Phenomena of El Nino

Explanation or also knows as explanatory text is a kind of text that explain the processes involved in the formation or workings of natural or sociocultural phenomena.

Explanation Text is a kind of Factual Genre. Explanation Text consist of two structure, they are general statement and explanation.

General Statement provides a general statement to position the reader. It focuses on generic, non human participants.

Explanation gives a sequence explaining of why or how something occurs. It is comprised mainly material and relational process, temporal, causal circumstances and conjunctions.

Here is one of the example of Explanation or Explanatory text. It explains about science. Remember that it is just a simple example. You can develop by your self according your need and your tasks from your teacher. You may use it as a reference.

The Phenomena of El Nino

What Is El Nino (General Statement)
El Nino is a warm water current which moves off the west coast of Chile and Peru. The current is believed to be closely associated with irregular variations in the global weather system and it occurs approximately every 7–11 years. The wider consequences of El Nino can be catastrophic. The current is associated with short–term changes in worldwide climate patterns, and may cause drought in place such as Australia and violent tropical cyclones in the Pacific Ocean. Some scientists fear that global warming may be making El Nino occur more frequently.

How does El Nino Occurs (Explanation)
The combined influence of land, sea and air on weather conditions can create a global climate rhythm. In the Pacific Ocean, for example (A), trade winds normally blow from east to west (1) along the Equator, “dragging” sun–warmed surface waters into a pool of North Australia and there by the thermocline–the boundary between warm surface waters and the cooler layers beneath (2). High cumulus  clouds form above these warm waters, bringing rain in the summer wet season (3). Cooler, nutrient-rich waters rise to surface off Southern America (4), supporting extensive shoals of anchovies on which a vast fishing industry has developed. The weather over this cold water region is dry.

Every 3–5 years a change occurs in the ocean-atmosphere interaction. The climatic pattern is reserved (B)–an event known as El Nino. The trade winds ease, or even reverse direction (5), during El Nino and the warm surface waters which have “pilled up” in the West Pacific flow back to warm the waters off South America by 2–3°C (6). This depresses the east thermocline (7) and dramatically affects the climate. In an El Nino year, drought and bush fires occur over Australia, while flood affect Bolivia and Peru. The warm waters off South America suppress upwelling of the cold nutrient rich waters, bringing disaster to the fishing industry.

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