Vietnam: What are the sample expository essays about the lightning phenomenon for 8th-grade students? How many regular assessment tests will an 8th-grade student take in Literature?

What are the sample expository essays about the lightning phenomenon for 8th-grade students in Vietnam?

Below are sample expository essays about the lightning phenomenon for 8th-grade students in Vietnam.

The explanation will help students better understand the essence of the lightning phenomenon – a natural phenomenon that is both familiar and mysterious.

Sample No. 1:

One of the few natural phenomena that we often encounter is lightning.

Currently, there is a branch of science dedicated to the study of lightning around the world, known as Brontology. They have provided detailed explanations of this phenomenon. Lightning (also simply called thunder) is a type of sound caused by lightning strikes. They are the product of the sudden increase in pressure and temperature from a lightning bolt, causing instantaneous expansion in the air. This expansion creates a sound shock wave - known as thunder. Depending on the distance and characteristics of the lightning strikes, we can hear different types of thunder. Generally, there are two types, one is a sudden loud bang, and the other is a prolonged series of sounds. With its characteristic loud sound, thunder can pierce a person's eardrums, leading to impaired hearing or temporary deafness.

Lightning usually appears after we see the flash of lightning across the sky, often accompanying rain. Hence, it can be easily seen frequently without having to chase after it. They do not cause significant damage to people and property, so there are no activities aimed at prevention or deterrence. To this day, lightning still appears naturally alongside human life.

Sample No. 2:

Lightning is a natural phenomenon, often occurring before, during, and even after rain.

The cause of the lightning phenomenon is when two clouds with opposite charges come close together, the electrical potential between them can reach millions of volts. Between the two clouds, there is an electrical spark discharge, and we see a lightning bolt. A few seconds later, we hear the explosion, which is thunder (as the speed of light is faster than the speed of sound, we see the lightning bolt first). When a storm cloud with electrical charge approaches the ground in open areas and encounters a tall object like trees or a person holding a spade, there will be an electrical discharge phenomenon between the cloud and the ground. That is the lightning phenomenon. During lightning discharge in the atmosphere, a lightning bolt can travel at a speed of 36,000 km/h. Lightning is the movement of ions, but the image of lightning is created by glowing plasma current, so it can be seen before hearing the sound because sound travels at a speed of only 1,230 km/h under normal air conditions, while light travels at 299,792,458 m/s. Lightning can reach temperatures of 30,000°C, 20 times hotter than the temperature needed to turn silica sand into glass.

Therefore, we need to be fully equipped with knowledge about lightning to avoid unwanted dangers.

Sample No. 3:

When the sky turns to rain, all things will become fresh and full of life, but when it rains too heavily, extremely dangerous phenomena like lightning will appear.

Lightning, also known by the shorter name thunder, is the sound created by lightning strikes. We might wonder what causes the formation of lightning; it is due to a sudden increase in air pressure and temperature, causing instantaneous expansion in the air, creating a sound shock wave.

Lightning is extremely dangerous as it can cause electric shock or death if someone is struck. However, lightning is not entirely harmful; it also brings some benefits like creating the ozone layer for the atmosphere, improving soil, and enhancing the growth potential of plants by creating nitrogen for them to develop.

There are many ways to avoid lightning such as avoiding going out on days with heavy rain and lightning, but if it is necessary to go out, avoid standing under large trees or using a mobile phone. All natural phenomena are incredibly special and have their own beauty; we should always cherish and love the nature around us.

Lightning is an incredibly special and interesting natural phenomenon, helping us understand the beauty of nature and surroundings; however, it is also quite dangerous, so each person needs to be fully equipped with knowledge for prevention.

Note: The information is for reference only.

What are the sample expository essays about the lightning phenomenon for 8th-grade students in Vietnam? How many regular assessment tests will an 8th-grade student in Vietnam take in Literature? (Image from the Internet)

How many regular assessment tests will an 8th-grade student in Vietnam take in Literature?

Under Clause 2 Article 6 of Circular 22/2021/TT-BGDDT regulating regular assessment for secondary school students in Vietnam:

Regular assessment

...

2. In each subject, each student shall be examined and assessed multiple times where several examinations and assessment satisfactory to teaching progress as per education plans of specialized departments are selected and the results thereof are recorded in student monitor and assessment record (by classes) in order to assess learning results of a subject according to Clause 1 Article 9 hereof as follows:

a) For subjects where assessment is conducted via feedback (does not include learning topics): choose twice each semester.

b) For subjects where assessment is conducted via both feedback and scores (does not include learning topics), choose regular assessment scores (hereinafter referred to as “DDGtx”) in each semester as follows:

- Subjects that have 35 periods/school year: 2 DDGtx.

- Subjects that have from more than 35 periods/school year to 70 periods/school year: 3 DDGtx.

- Subjects that have more than 70 periods/school year: 4 DDGtx.

...

At the same time, under Section 8, the General Education Program in Literature issued with Circular 32/2018/TT-BGDDT, the time allocated for 8th-grade Literature is 140 lessons/year.

Therefore, 8th-grade students will take 04 regular assessment tests in Literature.

What are the requirements for an 8th-grade student in Vietnam to be advanced to the next grade?

Under Clause 1 Article 12 of Circular 22/2021/TT-BGDDT regulating the requirements for an 8th-grade student in Vietnam to be advanced to the next grade:

- Training results of the entire school year (including re-assessment results after training during summer break) are Qualified or higher.

- Learning results of the entire school year (including re-assessment results of all subjects) are Qualified or higher.

- Number of days leave does not exceed 45 half-days (calculated according to education plans which is 1 half-day for every day under formal education plan, including permitted leave, unpermitted leave, continuous leave, and intermittent leave).