"Changes of Sea and Land" Land and Ocean PPT Courseware 2

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"Changes of Sea and Land" Land and Ocean PPT Courseware 2

Review Please indicate the names and locations of the seven continents and four oceans

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.

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

"Fixity Theory" of the Earth

Changes in the sea

Crustal changes and sea level rise and fall are the main causes of sea and land changes.

Human activities, such as reclamation and land reclamation, can also cause changes in the sea and land.

Inquiry activities

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

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;

Wegener's continental drift hypothesis:

1. Two hundred million years ago, all the continents on the earth were connected to each other and surrounded by a vast ocean.

2. Later, the original continent split into several continents and slowly drifted apart, gradually forming the current distribution of seven continents and four oceans.

According to the continental drift hypothesis, the order of changes in the distribution of land and sea on Earth from early to late is ( )

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 was ____ (is/not) a cold zone, and it later ________ to its current location.

Plate theory:

The earth's surface, which is composed of rocks, is not one piece but is made up of ____. The world is roughly divided into ____ plates.

All major sectors are in constant ____.

The crust within the plates is relatively ____; the crust at the interface between plates is relatively ____. The world's volcanoes and earthquakes are concentrated in the ____ zone.

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

4. Taiwan Island, where earthquakes often occur, is located at the junction of two major plates. The two major plates are ( )

A. Eurasian Plate and Pacific Plate

B. Eurasian Plate and African Plate

C. Eurasian Plate and Indian Ocean Plate

D. Eurasian Plate and American Plate

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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...

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Update Time: 2024-11-24

This template belongs to Geography courseware People's Education Edition Geography for Grade 7 Volume 1 industry PPT template

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