"History of the Earth" Earth in the Universe PPT courseware

"History of the Earth" Earth in the Universe PPT courseware

Part One Content: Learning Objectives:

1. Understand the chronological divisions of the earth’s geological history. (emphasis)

2. Understand the main role of stratigraphic and fossil research in understanding the history of the earth. (emphasis)

3. Be able to briefly describe the evolution of the earth based on geological timescales. (important and difficult points)

The history of the earth PPT, part 2: independent preview and exploration of new knowledge

1. Fossils and Geological Time

1. Earth's history: approximately _______ years.

2. Ways of understanding: Studying _______ is the most important way.

3. strata

(1) Meaning: layered rock with _______.

(2) Sedimentary strata are characterized by a bedding structure: generally the layer deposited first is on the bottom, and the layer deposited later is on top. Often contains fossils: biological remains or remains contained in sediments.

(3) Distribution rules: The older the strata, the more ________ and the more ________ biological fossils they contain.

(4) Research significance: By studying the strata and the fossils they contain, we can understand the life history and paleogeographic environment of the earth.

2. The evolution of the earth

1. Precambrian

(1) Time: from the birth of the earth to hundreds of millions of years ago, including the Hadean, ______, and _____ eons, accounting for 90% of the earth’s history.

(2) Evolutionary characteristics

① Atmospheric evolution: Evolution from an oxygen-free environment of the original atmosphere to an oxygen-free environment.

② Biological evolution: ______ organisms and ______ organisms evolved from prokaryotes.

③Geological minerals: important metal minerals ______ period.

2. Paleozoic Era

(1) Time: ______ billion to ______ billion years ago, which can be divided into the Early Paleozoic Era and the Late Paleozoic Era.

(2) Evolutionary characteristics

①Evolution of sea and land: ______ is violent, forming ______.

The History of the Earth PPT, Part Three: Collaborative Exploration and Overcoming Difficulties

Earth's evolutionary history

"Jurassic Park" is a 1993 science fiction adventure film that was released in the United States on June 11, 1993. The film mainly tells the story of Dr. Hammond convening a large number of scientists to extract the genetic genes of dinosaurs using dinosaur blood condensed in prehistoric mosquitoes in amber, resurrecting the prehistoric behemoths that had been extinct for 65 million years, and turning the entire Isla Nublar into a dinosaur. Paradise, namely "Jurassic Park". But when Hammond took his grandkids on their first tour, the dinosaurs showed up.

Question 1 (Geography Practice Ability) In which era in geological history did the dinosaurs in the science fiction movie "Jurassic Park" mainly appear? About how many years ago?

Tip: Dinosaurs mainly appeared in the Jurassic and Cretaceous periods of the Mesozoic Era, about 252 million to 66 million years ago.

Question 2 (Comprehensive thinking) Dinosaurs have long been extinct. How did we humans understand this early reptile?

Tip: Through the study of strata and fossils, we humans have learned basic information about dinosaurs and the paleogeographic environment in which they lived.

[Summary] The evolution history of the earth’s environment

According to isotope age dating, the Earth was formed about 4.6 billion years ago. From its formation to the present, the earth's environment has undergone tremendous changes. We can understand the evolution of its environment through the study of stratigraphy:

1. The evolution of land and sea

(1) The formation of the earth, the emergence of primitive oceans, and the initial distribution of oceans and land.

(2) In the Paleozoic Era, the crust moved violently, forming a combined ancient continent.

(3) In the Mesozoic Era, plate movements were intense, the combined ancient continents disintegrated, and the continents drifted.

(4) Cenozoic Era, forming the modern sea and land distribution pattern. Violent crustal movements formed the basic features of modern undulating terrain.

2. The evolution of the atmosphere

(1) Original atmosphere: The main components are carbon dioxide, carbon monoxide, methane and ammonia, lacking oxygen.

(2) Modern atmosphere: The main components are nitrogen and oxygen.

(3) Reasons for evolution: Plants absorb carbon dioxide and release oxygen through photosynthesis. Therefore, the emergence and evolution of life on Earth are inseparable from the increase in oxygen in the atmosphere.

3. evolution of organisms

Scientists have conducted comparative studies on strata and paleontological fossils from around the world and found that the evolution of the earth shows obvious stages. The evolution of living things shows the characteristics of evolution from low-level to high-level, from simple to complex. The following are some geological timetables:

The History of the Earth PPT, Part 4: Achieving Quality and Solid Basics

The earth has a long past and a long future. The emergence and evolution of living things is only a small part of it, and the history of human beings is even more brief. Answer questions 1 to 3 accordingly.

1. Primitive fish appear in ()

A. Proterozoic Era B. Middle Paleozoic Era

C． Late Paleozoic Era D. Middle Mesozoic Era

2. The stratum containing trilobite fossils is ()

A. Paleozoic strata B. Proterozoic strata

C． Mesozoic strata D. Cenozoic strata

3. The biological species that became extinct at the same time as the dinosaurs is ()

A. primitive fish

B． ancient amphibians

C． More than 50% of invertebrate species in the ocean

D． Ferns

1.B　2.A　3.C　[Question 1: The early Paleozoic era was a period of unprecedented prosperity for marine invertebrates; in the middle period, vertebrates—fish—appeared; in the later period, fish gradually evolved into Amphibians. Question 2: Strata from different eras contain different biological fossils. Trilobites are marine invertebrates of the Paleozoic Era and became extinct at the end of the Paleozoic Era. Therefore, only the Paleozoic Era strata contain trilobite fossils. Question 3: The end of the Paleozoic Era and the end of the Mesozoic Era are the two most important global mass extinction periods in geological history. Among them, at the end of the Mesozoic Era, more than 50% of dinosaurs and invertebrate species in the ocean became extinct. ]

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

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