"Changes of Sea and Land" Land and Ocean PPT Courseware 4

"Changes of Sea and Land" Land and Ocean PPT Courseware 4

1. Create situations and introduce passion

Do you know the idiom "Vicissitudes of life"?

The vicissitudes of life - can be referred to as the vicissitudes of life, comes from the ancient Chinese book "The Legend of Immortals: Magu". Legend has it that in ancient times there was a fairy named Magu who claimed to have seen the East China Sea turn into mulberry fields three times. Later generations used this change of sea and land as a metaphor for the great changes in the world.

In fact, the original meaning of vicissitudes of life refers to the changes in sea and land.

So, what factors caused this change of sea and land?

Let’s take a look at a few more pictures. Maybe you will know the secret after reading them.

Dutch land reclamation project

The Netherlands is a world-famous "Low Countries". One-quarter of the country's land is below sea level. In order to expand the land area, the Dutch people use reclamation dams to create land from the sea.

What causes this change in land and sea?

The beautiful island country of Tuvalu in the South Pacific is likely to become the first country to "sink".

The country's Meteorological Bureau estimates that in 50 years, sea levels will rise by 37.6 centimeters, which means that at least 60% of Tuvalu's land will completely sink into the sea.

This means doom for Tuvalu because when the tide rises Tuvalu

There will be no land left above the sea.

How are the outlines of land and sea formed?

Is the distribution of the seven continents and four oceans fixed?

"Activity Theory" of the Earth

The earth beneath our feet is in motion, and the seven continents and four oceans are constantly changing.

"Fixity Theory" of the Earth

How solid and stable the earth is. The outline of the sea and land has been like this since ancient times.

Inquiry activities

Who was the first person to propose the "activity theory" of the earth?

German scientist Wegener

What phenomenon did he stumble upon on the map? What doctrine is proposed?

Inspiration from the world map

The concavities and convexities of the continental contours on both sides of the Atlantic, especially those of Africa and South America, are very consistent;

Could the African continent and the South American continent have been connected before? It was only later that it broke apart due to the action of some force.

Could the continent be drifting?

Wegener's continental drift hypothesis:

1. Two hundred million years ago, all the continents on the earth were _______ a continent, surrounded by a vast ocean.

2. Later, the original continent _______ into several continents, slowly _______, and gradually formed the distribution of _______ and _______ today.

Modern scientific research discovery: Coal discovered in the cold Antarctic continent

Coal evolved from ancient plants buried deep underground, and the current climate in Antarctica barely supports the survival of green plants.

This fact shows that Antarctica's original location _____ (is/not) the cold zone, and that it later _____ to its current location.

Earthquake precursors:

See if you can fill in fish, pigs, dogs, chickens, ducks, mice, etc.

In the parentheses, form the proverb about animal activity before the earthquake:

( ) moved away and fled, ( ) jumped into the water in panic,

( ) fly up the tree, ( ) don’t go into the water,

( ) arches wildly, ( ) screams wildly.

Measures to be taken during an earthquake:

A. You should run away immediately or jump off the building ( )

B. You should pack up your things and leave immediately ( )

C. Immediately hide under sturdy furniture and avoid the earthquake on the spot. After the main earthquake passes, evacuate to an open area outdoors in an orderly manner. ( )

D. Immediately call your family to tell them about the earthquake, and then run away ( )

Standard experience

1. The main reason for the changes in the earth’s land and sea is ( )

A. Human production and life activities

B. Global climate change

C. A large number of water and soil changes

D. Changes in the earth's crust and rise and fall of sea levels

2. When collision and extrusion occur between plates, the geographical phenomenon produced on the earth’s surface is ( )

A. Form a rift B. Form a trough

C. To form an ocean D. To form a mountain

3. The plate that is almost entirely located in the ocean is ( )

A. Eurasian Plate B. American Plate

C. Indian Ocean Plate D. Pacific Plate

Homework after class:

1. Try the plate tectonics theory to explain the following phenomena:

(1) The Red Sea continues to expand;

(2) The Himalayas continue to rise;

(3) There are many earthquakes in Japan.

2. Draw a simplified diagram of the six major sections and fill in the section names.

After-class exploration:

Predict based on what you have learned: What will the world look like in the future?

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For more information about the PPT courseware "Changes of Land and Sea" PPT courseware, please click on the "Changes of Sea and Land ppt Land and Ocean ppt" tab.

"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...