"The Evolution of the Earth" Earth in the Universe PPT

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"The Evolution of the Earth" Earth in the Universe PPT

Part 1: Strengthening the foundation is just about implementation

[Self-reading textbook·Fill in key points]

1. Original atmosphere, ocean and land

1. The birth of the earth: It was formed _____ years ago. At the beginning of its birth, it was continuously hit by _____, which caused the temperature of the earth's surface to continue to increase, and most of the rocks on the earth were in a molten state.

2. Formation of the Earth's Crust: Meteor impacts decreased and the Earth gradually cooled. _____The surface cooled to form the original crust.

3. The formation of the primitive atmosphere: The gases inside the earth overflowed to form the primitive atmosphere.

4． The formation of the primitive ocean: Volcanic eruptions released a large amount of _____, carbon dioxide, nitrogen, hydrogen and other gases, forming clouds. The clouds continued to condense and rain poured to the surface. The rainwater on the surface gathered in the _____ zone, and the primitive ocean began to form.

2. Geological time scale

3. The evolution history of the earth

1. Archaean

(1) Time: 2.5 billion years ago.

(2) Environmental changes: magma activity is frequent and tectonic movements are intense. The volcanic activity is intense and the carbon dioxide content in the atmosphere is high. Surface water bodies are widely distributed and the land area is _____. By the Late Archean, small-scale _____ began to form in some areas.

(3) Mineralization situation: It is an important period in geological history for the formation of _____.

(4) The emergence of life: In the early days, there was no life phenomenon on the earth. It took about a billion years for primitive life to appear, mainly _____. About 3.1 billion years ago, _____ began to reproduce.

2. Proterozoic Era

(1) Time: 2.5 billion to 541 million years ago.

(2) Environmental changes: The earth's crust has undergone many tectonic movements, and the scale of the land has further expanded, forming many stable _____.

(3) Mineralization situation: The formation contains relatively abundant minerals, mainly _____.

(4) Evolution of life: Algae are increasingly prosperous, and eukaryotes and multicellular organisms have evolved.

3. Paleozoic Era

(1) Time: 541 million to _____ billion years ago.

(2) Environmental changes: _____ experienced many major changes, forming the United Ancient Continent. There is _____ ancient land in the north and Gondwana in the south.

PPT on the evolution of the earth, part 2: attaching importance to problem-based teaching

Question 1: How to identify strata and fossils? Basic test points

[Thinking and exploring]

Coral reefs refer to the rock mass composed of the remains of coral groups after their death. The main body of coral reefs is composed of coral polyps. Coral polyps are a type of coelenterate in the ocean. During the growth process, coral polyps can absorb calcium and carbon dioxide in seawater, and then secrete Limestone becomes the shell of one's own survival. After subsequent compaction and petrification, these limestones formed islands and reefs, also known as coral reefs. Corals generally grow in seawater with a water temperature of 22 to 30°C and a certain salinity. At the same time, their photosynthesis also requires sufficient light.

[Exploration] Chinese geological and paleontological scientists have found coral fossils on the slopes of the Himalayas many times. Please use this to speculate on the paleogeographic environment of the Himalayas.

Tip: A long time ago, the Himalayas were a warm shallow sea environment. Later, due to the movement of the earth's crust, the ocean turned into land.

[System Cognition]

A method to determine the age of strata using the laws of biological evolution

Strata from different eras generally contain different fossils, while strata from the same era often contain the same or similar fossils. Therefore, fossils can be used to determine the sequence and age of strata according to the evolutionary laws of paleontology. In a certain environment, a certain group of organisms live, which will leave a natural imprint on the organisms. In this way, biological fossils can be used to restore the living era and paleogeographic environment of organisms. For example: in warm and vast shallow sea environments, limestone composed of coral reefs can be formed; in hot and humid forested areas, coal-bearing strata rich in plant fossils can be formed.

[Training to pass the test]

1. Fossils are often found in which of the following types of rocks ()

A. Sedimentary rocks B. igneous rock

C． Metamorphic rock D. granite

2. Scientists conducted comparative studies on strata and paleontological fossils from around the world and found that the evolution of the earth showed obvious ()

A. Holistic b. stage

C． Difference D. regional

3. Which of the following geological eras does not belong to the Mesozoic Era ()

A. Triassic B. Jurassic

C． Permian D. Cretaceous

Question 2: What is the evolution process of the earth? Important and difficult test points

[Thinking and exploring]

Swallow stone, also called Duofu stone, is scientifically called trilobite fossil. During the formation process, a part of the trilobite was fossilized. The fossilized skull of this part is curved like a bow. The two bow thorns are twice as large as the body. The two bows are like wings and merge into one. The body is as small as a swift, so it is named. Stone Play The author also called it the "Flying Sky Stone".

[Problem Design]

1. From the perspective of "regional cognition", analyze the geographical environment characteristics of trilobite life and the time of their extinction on the earth.

Tip: Trilobites lived in the warm waters of the early Paleozoic. The time of extinction on Earth was the end of the Paleozoic Era.

2. Use "comprehensive thinking" to analyze what type of rock the rock formation that forms the swallow stone belongs to? What are the main processes in the development of the Earth's surface during its formation?

Hint: sedimentary rocks. During the formation of swallow stone, the earth's surface experienced the subsidence and deposition process of the strata.

The evolution process of the earth PPT, the third part: Carry out structural evaluation of thinking

Structural evaluation of thinking - the "pages" and "words" that record the history of the earth

In 1977, more than 200 ancient cell fossils that were clearly similar to prokaryotic algae were discovered in the ancient accumulation rocks of the Swaziland system in South Africa 3.5 billion years ago. Chinese scientists discovered a large number of ancient marine fossils during their expedition in the Himalayas. Foreign scientists have discovered that the Carboniferous-Permian strata of Brazil and South Africa contain the fossils of Mesosaurus, a reptile that lived in fresh or brackish water. However, Mesosaurus is a reptile and cannot fly across the ocean. What conclusion can you draw from the above material?

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For more information about the PPT courseware "The Earth in the Universe and the Evolution of the Earth", please click on the "Earth in the Universe ppt The Evolution of the Earth ppt" tag.

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Update Time: 2024-09-29

This template belongs to Geography courseware Compulsory Course 1 of High School Geography in China Graphics Edition industry PPT template

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