"Earth's Cosmic Environment" Viewing the Earth from the Universe PPT Download (Lesson 3 Earth)

Description

"Earth's Cosmic Environment" Viewing the Earth from the Universe PPT Download (Lesson 3 Earth)

Part One: Learning Objectives

1. Use data to explain that the earth is an ordinary yet special planet in the solar system.

2. Understand the reasons for the emergence of life on earth by analyzing the earth’s cosmic environment.

Earth’s cosmic environment PPT, part 2: sort out the teaching materials and lay a solid foundation

1. Ordinaryness

1. The revolution characteristics are the same: the eight planets all revolve around the sun, their orbits are approximately circular, their orbital surfaces are almost on the same plane, and their revolution directions are all ________.

2. Similar physical properties: Like Mercury, Venus, and Mars, they are all ________; there are many similarities between them.

2. Particularity

1. Performance: It is the only celestial body in the solar system that humans have discovered so far that has life.

2. Conditions for the existence of life

(1) External conditions - safe cosmic environment: large and asteroids go their own way without interfering with each other.

(2) Own conditions - three "moderate", as shown in the figure below:

Earth’s cosmic environment PPT, the third part: focus on exploration and improvement of literacy

Research point Planet Earth

Inquiry guide

Read the material and answer the following questions.

Material 1 January 29, 2017 "Science China": In the solar system, the sun is the only celestial body that emits its own light. Its mass is about 330,000 times that of the earth, and it is also the most important member of the solar system. Today's sun is in the prime of stellar evolution, and the hydrogen used for nuclear fusion in its core has not been used up, so its stable illumination will last for hundreds of millions of years. The sun has not changed significantly since the evolution of life on earth. The picture below is a schematic diagram of the movement of the eight planets in the solar system.

1. Based on the "Schematic diagram of the movement of the eight planets in the solar system" in Material 1, summarize the movement characteristics of the eight planets in the solar system.

Answer: (1) Isotropic: The direction of revolution around the sun is from west to east.

(2) Near circularity: The orbit around the sun is approximately circular.

(3) Coplanarity: The orbital surfaces are almost on the same plane.

2. Read material one and analyze the external conditions for the existence of life on earth.

Answer: (1) The sun is in its prime and stable, and the earth can receive stable sunlight.

(2) Large and asteroids go their own way without interfering with each other, allowing the earth to have a safe cosmic environment.

3. The earth has liquid water, suitable temperatures and a relatively thick atmosphere required for biological survival. These conditions are called "golden chain conditions" by scientists. Reading Material 2: Analyze the reasons why the earth has these favorable conditions from the aspects of the distance between the sun and the earth, the period of rotation, volume and mass.

Answer: (1) The distance between the sun and the earth: The moderate distance between the sun and the earth ensures suitable temperature conditions on the earth's surface, which is conducive to the occurrence and development of life processes. It also ensures the existence of liquid water and creates conditions for biological survival.

(2) Rotation cycle: The earth's rotation cycle is not too long, and the day-night cycle is only 24 hours, which prevents the temperature from rising too high during the day and cooling from too low at night, ensuring the existence and development of life on earth.

(3) Volume and mass: With moderate volume and mass, its gravity can cause the atmosphere to gather around the earth, forming a primitive atmosphere surrounding the earth, and gradually evolving into an atmosphere suitable for biological breathing.

Core summary

1. Ordinariness of the Earth

The earth is an ordinary planet, mainly because it has many similarities with other planets, specifically as follows:

(1) They are all approximately spherical celestial bodies that do not emit light and are opaque.

(2) Motion characteristics: It has the same characteristics as the orbit of other planets in the solar system, coplanarity, and near-circularity.

(3) Structural characteristics: Similar to terrestrial planets in terms of structural characteristics such as mass, volume, average density, rotation and revolution period.

2. The special characteristics of the earth - a planet with life

(1) External conditions for the existence of life on earth

External conditions mainly refer to the cosmic environment of the celestial system where the earth is located.

(2) The Earth’s own conditions for the existence of life

Self-conditions mainly refer to suitable temperature conditions, atmospheric conditions suitable for biological survival and the existence of liquid water.

Track training

“It’s not just a planet, It’s home” is an appropriate evaluation of the earth’s status in the solar system. Complete questions 1 to 3 accordingly.

1. The special characteristics of the earth are reflected in

A. The smallest mass among the eight planets

B. The direction of revolution is different from other planets

C. There is both rotational motion and revolutional motion

D. The only planet currently known to have advanced intelligent life in the solar system

2. There is an atmosphere on the surface of the earth, mainly because

A. Moderate distance from the sun

B. The size and mass of the earth itself are moderate

C. Green plants can perform photosynthesis

D. The joint effects of various celestial bodies in the solar system

3. There are temperature conditions necessary for the survival of life on the earth because

A. The earth’s mass is moderate B. The earth’s volume is moderate

C. The distance between the sun and the earth is moderate D. The number of satellites on the earth is moderate

Earth’s cosmic environment PPT, Part 4: Class drills and knowledge implementation

Read the table below and complete questions 1-2.

1. It can be seen from the table that the closest among the four planets is

A. Mass B. Revolution period

C. Volume D. Average density

2. Some of the planets in the solar system reflected in the table have certain similarities in their orbits around the sun. Which of the following analysis is incorrect?

A. Isotropy - the rotation direction of each planet is the same as the rotation direction of the earth

B. Coplanarity - the orbital plane of each planet and the orbital plane of the Earth are almost in the same plane

C. Near circularity - the orbits of each planet around the sun are approximately perfect circle ellipses

D. Each planet moves around the sun in its own orbit according to certain rules, and each goes its own way without interfering with each other.

3. Compared with planets ①②, one of the basic conditions for the existence of life on the earth is

A. Complex terrain and lithosphere

B. Strong solar radiation and sufficient water vapor

C. Suitable atmospheric thickness and atmospheric composition

D. Strong earthquakes and volcanic activities

4. Which statement about the planets in the picture is incorrect?

A. The Earth has the largest mass among the three planets

B. There is both rotational and revolutional motion

C. The direction of revolution is from west to east

D. ① is Venus, ② is Mars

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Update Time: 2024-09-02

This template belongs to Geography courseware Lu Ke version of high school geography compulsory course I industry PPT template

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