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Pertanyaan

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WHAT IS THE AURORA BOREALIS?

The Aurora is an incredible light show caused by collisions between electrically charged particles released from the sun that enter the earth’s atmosphere and collide with gases such as oxygen and nitrogen. The lights are seen around the magnetic poles of the northern and southern hemispheres.

Auroras that occur in the northern hemisphere are called ‘Aurora Borealis’ or ‘northern lights’ and auroras that occur in the southern hempishere are called ‘Aurora Australis’ or ‘southern lights’.

Both Aurora’s can be seen in the northern or southern hemisphere, in an irregularly shaped oval centred over each magnetic pole. Scientists have learned that in most instances northern and southern auroras are mirror-like images that occur at the same time, with similar shapes and colours. Auroral displays can appear in many vivid colours, although green is the most common. Colours such as red, yellow, green, blue and violet are also seen occasionally. The auroras can appear in many forms, from small patches of light that appear out of nowhere to streamers, arcs, rippling curtains or shooting rays that light up the sky with an incredible glow.

Auroras are the result of collisions between gaseous particles (in the Earth’s atmosphere) with charged particles (released from the sun’s atmosphere). Variations in colour are due to the type of gas particles that are colliding. The most common aurora colour which is green, is produced by oxygen molecules located about 60 miles above the earth. The rarer red auroras are produced by high-altitude oxygen, at heights of up to 200 miles. Nitrogen produces blue or purple aurora.

Why did the writer write text?

  1. To describe about Aurora in general

  2. To inform readers about the meaning of Aurora

  3. To explain how to see Aurora

  4. To tell how Aurora is formed

N. Mulyandini

Master Teacher

Mahasiswa/Alumni Universitas Indonesia

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah D. To tell how Aurora is formed.

Pembahasan

Soal ini menanyakan mengapa penulis menulis teks yang tersedia.

Kalimat pertama paragraf satu teks, yang berbunyi "The Aurora is an incredible light show caused by collisions between electrically charged particles....", menyebutkan bahwa aurora disebabkan oleh tumbukan antara partikel bermuatan listrik dari matahari yang memasuki atmosfer bumi dan bertabrakan dengan gas seperti oksigen dan nitrogen.

Ide yang sama ditegaskan kembali pada kalimat pertama paragraf empat, yaitu "Auroras are the result of collisions between gaseous particles (in the Earth’s atmosphere) with charged particles (released from the sun’s atmosphere)".

Berdasarkan teks, dapat disimpulkan bahwa alasan penulisan teks ini adalah untuk menjelaskan bagaimana Aurora terbentuk. 

Jadi, jawaban yang tepat adalah D. To tell how Aurora is formed.

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