What are the main reasons for the changes on land and sea?

It is the extrusion of the earth's crustal plates that causes changes in the surface of the earth, resulting in a difference in elevation, high for mountains and rivers, and low for the ocean water flowing to the accumulation site. This is probably the reason for the changes on land and sea.

Our earth's surface appears to be a hard crust, but in fact the earth's crust is slowly drifting and rising on lava. The earth's crust is also colliding and squeezing with each other. In this way, the height of a part of the earth's crust changes, and the sea water flows downward, of course, so the position of the sea and the land changes.

It should be the movement of the elements inside the earth, and the underlying reason is that the mutual gravitational pull between the sun and the earth causes the movement of the internal elements.

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1.crustal changes;

2. Rise and fall of sea level;

3 Human activities.

The movement of the earth's crust.

Rise and fall of sea level.

Human activity.

What are the reasons for the change of land and sea?

1.Changes in the earth's crust.

2.Rise and fall of sea level.

3.Human activity. For example, heavy rain erosion, land reclamation, etc., will also cause changes in the sea and land.

Modern scientific research has shown that the changes in the earth's crust and the rise and fall of sea level are the main causes of sea and land changes.

The Earth's surface is in constant motion and change. Because changes often take a long time, they are mostly not noticeable in the short term.

Generally speaking, the interior of the plate is relatively stable, and the area at the junction of the plate and the plate is more active in the crust of the earth, some of which are split and stretched, and some are collided and squeezed. ** and volcanic activity is capable of changing the morphology of the earth's surface in a very short period of time.

The theory of the evolution of the movement of the earth's crust and the distribution of land and sea. The large-scale horizontal movement of continents with each other and between continents relative to ocean basins is called continental drift.

The main cause of land and sea change is the movement of the earth's crust.

The Earth's surface is in constant motion and change. In the process of the earth's crust moving, it will also cause the ground to shake, that is, **. When hot magma rushes out of the surface along a crack in the earth's crust, it is called a volcanic eruption.

Volcanoes are highlands formed by the accumulation of material from volcanic craters** and volcanic activity can change the morphology of the surface in a very short period of time.

When the expanding oceanic crust meets the continental crust, it subducts into the mantle beneath the continental crust and gradually melts and dies.

This process is actually oceanic crust"metabolism", which takes about 200 million years. It is also the lower limit of the age of the rocks on the seafloor.

Land and sea change is a natural phenomenon that occurs on the earth, and the main causes of land and sea change are crustal changes, sea level rises and falls, and human activities.

Because the material inside the earth is always in constant motion, it causes the earth's crust to change, sometimes rising, sometimes falling. The water near the edge of the continent is relatively shallow, and if the earth's crust rises, the seabed will be exposed and become land. On the contrary, if the land by the sea sinks, it becomes the ocean.

Sometimes volcanic eruptions also occur on the ocean floor.

Or**, it will form an undersea plateau, and if mountains and volcanoes are exposed to the sea, they will also become land.

For example, archaeologists have found fossils of marine animals in the Himalayas, which illustrates the Himalayas.

In geological time, it used to be the ocean, and the cause of this land-sea transition is precisely the movement of the earth's crust.

On the seabed of China's eastern sea, people have found the remains of ancient rivers, which shows that China's eastern seabed continent was once land in geological time, and the cause of sea and land changes is the change of the earth's crust or the rise and fall of sea level.

The Netherlands is located in the western part of Europe.

It is a world-famous "lowland country", nearly a quarter of the country's land area is below sea level, and in order to obtain more land, the Dutch built a dam around the sea. This kind of land reclamation is a man-made change of land and sea.

The causes of land and sea change are divided into natural causes and man-made causes, natural causes are changes in the earth's crust and rise and fall of sea level, and man-made causes are human activities.

One is the melting of icebergs, the second is the problem of crustal movement, the third is the impact of **, and the fourth is artificial reclamation.

Changes in nature, warming climate, melting glaciers.

1. Biological changes on land and sea.

Biological reefs and islands formed by living organisms, and human activities such as sea reclamation can form small areas of land and sea changes.

2. The sea and land changes caused by the action of **.

**The formation of a tsunami can cause short-lived changes on land and sea. **Faults, depressions or uplifts in the formation of rock formations can cause small areas of land and sea changes.

3. Continental and sea changes caused by volcanism.

Volcanic eruptions. Tsunamis can be formed, volcanic islands can be formed, rock fractures, depressions or uplifts can be formed, and volcanism can cause small areas of land and sea changes.

4. Changes in land and sea caused by temperature changes.

A decrease in the earth's temperature can freeze the sea and reduce the amount of seawater; An increase in the Earth's temperature can cause icebergs to melt and increase the amount of ocean water. A decrease or increase in the amount of seawater can cause changes on land and sea.

5. Marine and terrestrial changes caused by changes in crustal rock strata.

The rock layers that make up the earth's crust are formed by folds or faults, and the ground rises and falls, which can cause changes on land and sea.

6. Maritime and terrestrial changes caused by the action of water and wind.

The denudation and transport of water can form a delta at the mouth of a river.

It can cause changes on land and sea. Wind erosion and transport can work together with water erosion and transport, or it can act alone to form a decrease or rise at a certain position on the earth's surface, which can cause sea and land changes. The denudation and transport of icebergs can also cause land and sea changes.

The collapse of bedrock near the sea can cause changes on land and sea.

7. The rotation of the earth's outer sphere causes changes in the sea and land.

The rotation of the Earth's outer sphere leads to a change in the position of the Earth's poles, which can cause changes in land and sea.

8. Celestial action can cause changes on land and sea.

When a cosmic celestial body descends on the earth, it can lower or raise the local position of the earth's surface, which can cause changes in land and sea.

Changes in the earth's crust and rise and fall in sea level

Crustal activity and sea level rise and fall are the main causes of land-sea change.

The reasons for the change of land and sea are as follows:

1. Biological changes on land and sea caused by biological processes, biological reefs and islands formed by organisms, and activities such as human reclamation can form small areas of sea and land changes.

2. The formation of tsunami can cause short-term sea and land changes, and the formation of rock faults, depressions or uplifts can cause small areas of sea and land changes.

3. Volcanic changes caused by sea and land, volcanic eruptions can form tsunamis, can form volcanic islands, can form rock fractures, depressions or uplifts, and volcanism can cause small areas of sea and land changes.

4. The change of sea and land caused by temperature change, the decrease in the earth's temperature can make the sea water freeze and the amount of sea water decrease. An increase in the earth's temperature can cause icebergs to melt and rot sails, increase the amount of seawater, and reduce or increase the amount of seawater can cause changes on land and sea.

5. The changes of sea and land caused by the changes of crustal rock layers, the rise and fall of the ground caused by folds or faults in the rock layers that make up the earth's crust, can cause sea and land changes.

6. The rotation of the outer sphere of the earth causes changes in the sea and land, and the rotation of the outer sphere of the earth causes the change of the position of the earth's poles, which can cause the changes of the sea and land.

Land and sea changes

The change from sea to land or from land to sea at a certain location on the earth's surface is called land-sea transition, and land-sea transition is ocean-land transformation. According to the direction of motion, it can be divided into horizontal motion and vertical motion, horizontal motion refers to the movement of the rock layers that make up the earth's crust along the direction parallel to the earth's surface. Also known as orogeny or fold movement, this type of movement can often form huge folded mountain systems, as well as giant depressions, island arcs, ocean trenches, etc.

Vertical movement, also known as lifting movement and land-building movement, makes the rock layer appear as an uplift and the decline of adjacent areas, which can form plateaus, fault mountains and depressions, basins and plains, and can also cause sea transgression and sea retreat, so that the sea and land change. The movement of the earth's crust controls the distribution of sea and land on the earth's surface, affects the occurrence and development of various geological processes, forms various tectonic forms, and changes the original state of the rock layer, so some people also call the movement of the earth's crust tectonic movement.