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"Changes of Sea and Land" Land and Ocean PPT Courseware 5
Do you know the story of "Changing Oceans"? What does it mean? What is used as a metaphor now?
Legend has it that there was a fairy named Magu in ancient my country who saw the East China Sea turn into mulberry fields three times. Later generations used this vicissitudes of life to describe the great changes in the world. In fact, the original meaning of this story refers to the changes in sea and land. This is The issues we are going to study and discuss today.
So, what is the main cause of changes in sea and land?
The Himalayas were originally an ocean. Fossils of marine organisms were deposited in the rock formations on the seabed. The rock formations were squeezed and gradually lifted up to form mountains, turning the ocean into land.
In the process of the East China Sea changing from land to sea, the sea level gradually rises and submerges some of the coastal land, which shows that rising sea levels can turn land into oceans. When sea levels fall, the previously submerged land surfaces are exposed again, which means that falling sea levels can turn oceans into land.
It can be seen that changes in the earth's crust and rise and fall of sea levels are the main causes of changes in sea and land.
Human activities, such as "reclamation", etc., will also cause changes in the sea and land.
The convex part of the South American continent almost coincides with the concave part of the African continent! The two continents are like torn pages that can be pieced together.
Based on this phenomenon, German scientist Wegener proposed the continental drift hypothesis? What is the content of this hypothesis?
The theory of continental drift was strongly opposed by mainstream geologists and geophysicists after it was proposed, and it was not widely accepted during Wegener's lifetime. Wegener was killed during a scientific expedition in Greenland in 1930.
Reasons why the theory of continental drift is not accepted
A correct theory is often rejected as an error or as opposed to religion in its early stages, and is accepted as a dogma in its later stages.
Wegener and the theory of continental drift
After painstaking investigation, Wegener finally came up with two pieces of evidence:
Many organisms on the western shore of the First Atlantic are related;
Second, the rocks, strata, and folds on both sides of the Atlantic also match up.
Question: How was the Atlantic Ocean formed? How did the Pacific Ocean change?
(1) Fossils of marine life have been found in the Himalayas, which shows that the Himalayas were once oceans in geological time and have now become land. This means that the ocean can become land.
(2) Relics of ancient rivers and ancient human activities have been discovered in the seas of eastern my country, which illustrates that the submarine continental shelf in eastern my country was once land during geological times, but now it has become an ocean, which means that land can become an ocean.
(3) The Netherlands is a famous "Low Country". The Dutch have continuously expanded their country's land area by reclaiming land from the sea, which shows that our human activities can also cause changes in the sea and land, but this change is only local and small-scale. , and this kind of activity must follow the laws of nature, otherwise, nature will retaliate.
Use the theory of plate motion to explain the following phenomena:
According to measurements, the Red Sea between Asia and Africa is constantly expanding. Some predict that in tens of millions of years, the Red Sea will become a new ocean.
formation of red sea
Scientists from the United States, the United Kingdom and other countries have revealed that the Red Sea between northeastern Africa and the Arabian Peninsula is splitting. A new ocean may be formed in millions of years, and the African continent will also be divided into two parts. Some media say that there will be five oceans and six continents on the earth in the future.
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"Changes of Sea and Land" PPT download:
"Changes of Sea and Land" PPT download Part 1: Content objectives of this section: Give examples to illustrate that the land and sea on the earth's surface are in constant movement and change. Know the theory of continental drift and be able to use this theory to solve some problems. Changes in the sea. Changes in the sea, which can be referred to as...
"Changes of Sea and Land" PPT courseware:
"Changes of Sea and Land" PPT Courseware Part One: Teaching Objectives 1. Use examples to illustrate the changes of sea and land, and establish the scientific viewpoint of dialectical materialism that the sea and land are constantly moving and changing. 2. Understand the basic concepts of continental drift and plate tectonics, and be able to explain the world's main...
"Changes of Sea and Land" PPT:
"Changes of Sea and Land" PPT Part One Content: Course Questions Ask the question: What was the land like hundreds of millions of years ago? Establishing a hypothesis: Continental drift theory 200-300 million years ago, there was only one continent on the earth. Later, this supercontinent split into several continents, and...