"The Evolution of the Earth and the Origin of Life" PPT courseware

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"The Evolution of the Earth and the Origin of Life" PPT courseware

Part One: The Evolution of the Earth

When the earth was first born 4.6 billion years ago, did it look the same as it does now?

1. When the earth was first born, it was a ball of hot molten rock.

A fiery ball of magma.

Thinking: Comparing the two pictures below, can you imagine the appearance and changes of the earth between 4.6 billion and 2.6 billion years ago?

primitive earth

(About 3.8 billion years ago, the most primitive life forms were born in the ocean)

The solid crust gradually formed.

Cooling and solidification of magma

(4.6 billion-2.6 billion years ago)

The evolution of the earth and the origin of life PPT, Part 2: The birth of life

Review: About _______ ago, the most primitive life forms were born in _______.

So, how was life born?

Do you know any hypotheses about the origin of life?

Creationism

Creationism is also called special creationism. Creationism believes that all species in the biological world (including humans), as well as the heavenly bodies and the earth, were created by God. Once everything in the world is created, it will never change. Even if it does change, it can only change within the scope of that species. It is absolutely impossible to form new species. Creationism also believes that all living things are isolated from each other and have no biological relationship with each other.

spontaneous generation

The theory of spontaneous generation was a widely popular theory before the 19th century. This theory believed that life occurred naturally from inanimate matter. For example, in ancient my country, it was believed that "rotten grass turns into fireflies" (that is, fireflies are produced from piles of rotten grass), and carrion produces maggots. In the West, Aristotle (384 BC-322 BC) was a spontaneous generation theorist. Some people also proved through "experiments" that if they stuffed grains and old shirts into bottles and left them in a dark place, mice would appear after 21 days. What surprised him was that such "naturally" mice actually appeared. Exactly the same as common mice.

The evolution of the earth and the origin of life PPT, the third part: experimental activities

1. Miller simulation experiment

1) Experimental conditions:

(1) Original atmosphere: methane, ammonia, water, hydrogen

(2) Energy: lightning, ultraviolet light, cosmic rays

(3) Place: pristine ocean

2) Experimental results: Formation of organic small molecule substances

2. Theory of chemical evolution:

1) Inorganic small molecule substances chemically generate organic small molecules.

2) Small organic molecules form organic macromolecules - proteins and nucleic acids.

3) Organic polymer substances form a multi-molecular system with bounded membranes.

4) Multi-molecular systems evolved into primitive life.

(the most complex and decisive step)

Characteristics of primitive life: capable of simple material exchange; possessing primitive reproduction phenomena.

The evolution of the earth and the origin of life PPT, part 4 content: exercises:

1. At the beginning of the formation of the earth, the outside of the earth was:

A. Magma B. Solid rock shell C. Ocean D. Atmosphere

2. Life was formed in __________ __________ years ago.

3. The earth was formed _________ billions of years ago. 3.8 billion years ago, the most primitive life forms on the earth were born in ________. The outline of my country's continent was basically formed in the ________ era. During the large-scale orogeny of the Tertiary Period, the most majestic mountain range in the world - the ________ Mountains was formed.

4. In the original atmosphere of the earth, the missing ingredient is ( )

A.O2 B.NH3

C、H2O D、H2

Keywords: Free download of science PPT courseware for the second volume of the ninth grade of Zhejiang Education Edition, PPT download of the evolution of the earth and the origin of life, .PPT format;

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"The Evolution of the Earth and the Origin of Life" PPT:

"The Evolution of the Earth and the Origin of Life" PPT Part One: The Evolution of the Earth The Earth was formed by the collapse and condensation of the original solar nebula. The age of the Earth is approximately 4.6 billion years. The solar system was born about 5 billion years ago. After about 500 million years, the earth began to take shape...

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Update Time: 2024-06-29

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 2 industry PPT template

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