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"Changes of Sea and Land" Land and Ocean PPT Courseware 6
Do you know the story of "Changing Oceans"? What does it mean? What is used as a metaphor now?
Its original meaning is that the ocean will turn into land, and the land will turn into ocean. The main reason for the change is climate change. Generally used to describe the great changes in the world.
Evidence of land and sea changes:
What fossils of marine life found in rocks in the Himalayas tell us
What does the discovery of ancient river channels, wells and other human activity relics on the seabed in eastern my country reflect the past conditions of this sea area?
2. Continental drift hypothesis
Wegener and the theory of continental drift
One day in 1910, Wegener, who was only 30 years old, was lying on the hospital bed and his eyes happened to fall on a world map on the wall. "Strange! Why are the concave and convex contours of the continents on both sides of the Atlantic so consistent?" His mind could no longer calm down: "Could the African continent and the South American continent have been connected together before? It was only later that they were affected by some kind of force. It broke apart due to the action. Could the continents be drifting?"
The theory of continental drift believes that:
Two hundred million years ago, all the continents on the earth were connected to each other and surrounded by a vast ocean. Later, the original continent split into several continents, which slowly drifted and separated, gradually forming today's distribution of seven continents and four oceans.
continental drift
1. Do you think the theory of continental drift is fantasy, or does it have scientific basis?
2. Please look for evidence to prove
Thinking: The Himalayas are formed by the compression of which two plates?
Eurasian Plate and Indian Ocean Plate
The Alps were formed by the compression of which two plates?
Eurasian and African plates
Could you please combine the world topographic map and the plate diagram to analyze the reasons for the formation of the longest Andes Mountains in the world?
Class Diagnosis:
1. The idiom that can describe the changes in the surface morphology is ( )
A. Earth-shaking B. Changing with each passing day
C. Timeless D. Changes in the sea
2. Which of the following factors cannot directly cause changes in sea and land ( )
A. Changes in the earth's crust B. sea level rise and fall
C． human activities d. global warming
3. Regarding the changes in the earth's surface, the correct statement is ( )
A. Only changes in land and sea area
B． Only changes in the distribution of land and sea
C． never changes
D． There are changes in both sea and land area and changes in the distribution of sea and land
4. Which statement about the "Continental Drift Hypothesis" is wrong ( )
A. German scientist Wegener proposed in 1912
B. The earth had only one continent and ocean 200 million years ago
C. It is still not possible to prove the theory of continental drift
D. The outlines of the two sides of the Atlantic Ocean can be nested together.
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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...