Explain the eruption of a volcano, what happens when a volcano erupts

Let's do this in a few ways:

1. Materials.

large boxes of dried grain;

polystyrene cups, one per group;

Bendable straws, one per student;

Pencils, one for each group.

Action 1 Hand out cups, plates, straws, etc., to students.

2 Pierce several holes with a pencil around the mouth of the cup, about 1 inch (about centimeter) apart, with an appropriate distance between the openings, and the number of openings is equal to the number of students in the group.

3 Have your students insert the shorter end of the straw into the hole under the rim. Then, have a student use a pencil to prick a 3 4 1-inch hole in the bottom of the cup.

4 Ask a student to hold the cup in one hand and place it on the palm of the other hand so that it remains upright, and the teacher pours dry grain into the cup, which is about 3 4 of the cup's volume.

5 Students hold the cup containing the grain and turn it over carefully, snapping the cup onto the plate. Be careful not to let the grain leak out. One student continues to hold the cup so that the grain remains in the cup.

6 At the same time, each student puts the longer end of the straw into their mouth. After the teacher gives the order, the students blow together at the same time according to the pre-agreed number (e.g., 1 to 3 breaths).

What did you find?

What did you notice when you blew into the cup through a straw? Write it down in your own words and draw a sketch to illustrate it. Why do you think this is happening? What do you think?

Note to the teacher If the student is younger, you can make a hole in the cup beforehand and insert a straw. All students in a group must blow at the same time, otherwise the dry grain may be blown into the mouth of the student who does not blow. As the student blows, the dry grain can gush upwards (eject) through the hole in the bottom of the cup.

In this way, the students "saw" a simulated volcanic eruption. 2. Materials.

clay or plaster that can be used for modeling;

small jars or barrels (containers for liquids);

red food dyes;

Vinegar; — baking bread with baking soda;

A piece of cardboard or plywood.

Operation 1 Make a base of a volcano out of plaster or clay on cardboard or plywood.

2 Place a small jar (or bucket) on the base, build a model of the volcano around it, and set it aside to dry.

3 To simulate a volcanic eruption, put some red food dye and baking soda in a small jar (or bucket), then slowly pour in some vinegar.

What did you find?

What do you notice when you slowly pour the vinegar into a small jar of red dye and baking soda? Write it down in your own words and illustrate it with a simple diagram. Why do you think this is happening? What do you think?

Note to the teacher Depending on the age of the student, this activity can be demonstrated by the teacher or as a group activity.

The chemical reaction caused by soda and vinegar caused the liquid in the tank to overflow, showing the eruption of an "active volcano". Teachers should try to encourage students to use the word "chemistry."

Note: With this small canister, this volcano model can be reused.

Find a carton first. Put a balloon in it. Get another pile of rice noodles on top of the balloon. Pop the balloon. Just ok pull!

That's too much trouble!

Summary. Here's what it looks like: Volcanic eruptions occur when a volcano erupts, spewing out ash, magma, and pyroclastic debris.

In addition, volcanoes**, landslides, landslides, and active craters may occur. During the eruption, volcanic smoke can rise to a high altitude and volcanic ash can cover the entire area and wreak havoc on the surrounding area.

The forehand is as follows: a volcanic eruption occurs during a volcanic eruption, spewing out ash, magma, and volcanic debris to raise the source of the debris. In addition, volcanoes**, landslides, landslides, and active craters may occur.

During the eruption, volcanic smoke can rise to a high altitude and volcanic ash can cover the entire area and wreak havoc on the surrounding area.

Extended: A volcano erupts with a lot of geological activity that can wreak havoc on the surrounding area. One of the main sights of the eruption is the eruption of Mount Huochun, which can spew out large amounts of ash, magma and volcanic debris that could wreak havoc on the surrounding area.

Volcano** is another common sight, it is a volcano caused by a volcanic eruption, which can wreak havoc on the surrounding area.

What conditions are required for the formation of wind?

The formation of winds requires temperature differences and atmospheric pressure anomalies. When the temperature on the ground and at high altitude are different, the hot air cherry blossoms will rise, causing the air ridge to flow. The atmospheric pressure anomaly in the middle of the cherry blossom can also cause air currents to flow. These air currents are the wind.

Volcanic eruptions are caused by the magma in the upper part of the upper mantle of the earth's interior, due to the movement of the earth's plate to form a fault zone, that is, the volcanic channel under extreme pressure, the magma will break through the crust from the weakest part of the earth's crust along the volcanic channel and gush out; Thus, a volcanic eruption is formed.

When we mention ** Mountain, we will naturally associate the picture of volcanic eruption in our minds, so how did volcanic eruptions form? Let me explain it to you.

01 Volcanic eruption is a geological term, a peculiar geological phenomenon, a manifestation of crustal movement, and the most intense display of the earth's internal heat energy on the surface, which is the release of magma and other ejecta from the crater to the surface in a short period of time.

02 In ancient Rome, when people saw the phenomenon of volcanic eruptions, they attributed the cause of the burning of this mountain to the wrath of the fire god Volcano, so the volcano in the Lipari Islands in the Mediterranean Sea in southern Italy got its name, and also became the English name of the word volcano - volcano.

03 Magma is divided into primary magma and regenerated magma; The primary magma is formed by the molten material captured by the earth's core, and the earth's core captures the molten material and some other materials to form a huge thick molten layer, the composition of these materials is uneven, and the primary magma solidifies to form the most primitive earth's crust.

04 The various intrusive rocks we see, such as ultramafic rocks, mafic rocks, neutral rocks, acidic rocks and alkaline rocks, as well as all kinds of magma erupted by volcanoes, are all regenerated magma, but the depth of the channel, the material composition and the degree of differentiation are different.

05 Regenerated magma includes magma mutated from primary magma and remelted magma; The Earth's liquid layer is made up of regenerated magma formed by mutation of primary magma – formed by changes in temperature, composition, and state of matter.

Volcanic eruptions in nature refer to volcanic eruptions on the Earth's surface, which are caused by the movement of magma and gases and other substances inside the earth's crust. When the pressure inside the earth's crust increases, sensitive magma, gases, and other materials are continuously discharged, eventually forming volcanic eruptions. Generally speaking, volcanic eruptions can have serious effects on the surrounding Huanqiao Chai Tomb, such as bringing a lot of dust, rising temperatures, increased winds, destruction of vegetation, soil pollution, etc.

In addition, volcanic eruptions also produce a large amount of toxic gas, which is also a major threat to people's lives.

<> uneven temperature and density of lead in the Earth's interior, mantle convection or mantle plumes form inside the Earth's mantle. When a hot substance rises to the shallow part of the earth, partial melting occurs due to a decrease in pressure. By the good luck of external forces, these molten materials come together and form a magma sac in the shallow part of the earth.

When the pressure of the magma sac is greater than the pressure of the formation, the magma breaks through the earth's crust along the fault or weak point, causing a volcanic eruption.

The most powerful and spectacular eruptions of volcanic eruptions often occur in subduction zones. The volcanoes here can erupt again after hundreds of years of silence, and when they do, they are particularly powerful. Such volcanic eruptions often bring world destruction to humanity.

Volcanic eruptions can have precursors, such as deformation of the earth's surface, strange gases and smells from fumaroles, springs, etc.; The water level and water temperature will change abnormally; Organisms will have abnormal reactions, including fading and dying of plants, abnormal breeding behavior and death of small animals. Once you find the precursor of a volcanic eruption, you should choose a vehicle to leave as soon as possible, and cover your head with other items to prevent injuries during the escape.

The combination of volcanic ash and torrential rains from volcanic eruptions can wash away roads and bridges, inundating nearby villages and cities, leaving countless people homeless. When encountering a volcanic eruption, we should respond accordingly to the nature of the eruption.

How is a volcanic eruption caused? It turns out that the Earth's interior is filled with red-hot magma. Under extreme pressure, magma can break through the earth's crust from weak spots and erupt, causing volcanic eruptions.

Volcanoes can be divided into active, extinct and dormant volcanoes. The volcanoes on Mount Tambora and the Hawaiian Islands, which we mentioned earlier, are still active, and they are active volcanoes. An extinct volcano is a volcano that has been active in prehistory, but there is no record of eruption in history.

Most of the more than 600 volcanoes in China are extinct volcanoes. Some volcanoes have been active in history but have not been active since, and such volcanoes are called dormant volcanoes. A dormant volcano may suddenly "wake up" and become an active volcano.

Violent volcanic eruptions can swallow and destroy vast swathes of land and burn large numbers of lives and property to ashes. Surprisingly, however, volcanoes are often found in densely populated areas, as is the case around Mount Nasu and Mount Fuji in Japan. It turns out that the volcanic ash emitted by the volcano is a good natural fertilizer, and the mulberry trees in the Mt. Fuji area grow particularly well, which is conducive to sericulture. The Vesuvius region is rich in grapes.

Volcanic areas have a peculiar scene and often become a tourist attraction.

I couldn't bear it anymore, and I didn't need to endure it anymore to break out. I remember that in the early days, there were some people who used human sacrifices in order not to erupt volcanoes.

How are volcanic eruptions formed? Is there a pattern to volcanic eruptions?