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"Understanding Our Earth" Blue Earth PPT courseware
Think about it, what information do you know about our home planet? Try to share some with everyone!
1. The Earth’s Position in the Universe
total galaxy
It refers to the entire scope of the universe that can be observed and detected by people using existing observation methods and methods.
It is now believed that its radius is 15 billion light-years, its age is 15 billion years, and it contains more than 1 billion galaxies.
Milky Way
The Milky Way is the star system in which the solar system is located, including 120 billion stars and a large number of star clusters, nebulae, as well as various types of interstellar gas and interstellar dust.
It has a diameter of about 100,000 light-years, a central thickness of about 12,000 light-years, and a total mass of 140 billion times the mass of the Sun.
solar system
The solar system is the star system we are in now.
It is centered on the sun and a collection of all celestial bodies bound by the sun's gravity: 8 planets, at least 165 known satellites, and hundreds of millions of small solar system bodies.
2. The shape and size of the earth
1. What is the shape of the earth?
Students, what is the shape of the earth in your mind? In which part of the earth do we humans live? Try drawing a picture!
Panel Discussion: The Search for Evidence
Think about it, what examples in our lives can prove that the earth is a sphere?
Evidence 1: The scene of ships disappearing on the sea
When the ship went away, first the hull was invisible, and finally the mast of the ship was invisible.
Evidence 2: Total lunar eclipse scene
Evidence 3: Altitude changes of Polaris
In real life, the further north you go, the higher the North Star is.
2. How big is the earth?
Group discussion: collision of ideas
Since the earth is a sphere, don't humans in the southern hemisphere stand upside down? Won't they fall?
3. The Earth’s Inner Circles and Structure
Students, have you ever imagined what the depths of the earth beneath our feet are like?
Human exploration of the Earth’s internal structure
guessing stage
early detection stage
In the 1970s, the former Soviet Union implemented a huge continental scientific deep drilling project. Its Kola ultra-deep borehole reached 12,262 meters, which is the deepest ultra-deep hole in the world today and became the world's first deep laboratory.
modern detection stage
Experiment: Determine what's in my carton? (paper balls, coins)
Conclusion: People can use sound to detect something invisible. For places more than 6,000 meters underground, seismic waves can be used to detect.
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"Understanding Our Earth" Blue Earth PPT Courseware 2:
"Understanding Our Earth" Blue Earth PPT Courseware 2 1 How Big is the Earth? The Earth is an approximately elliptical sphere. It is the fifth largest planet in the solar system. The equatorial radius is 6378.2 kilometers. The surface area is about 510 million square kilometers. 2. The year of the earth...