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"Changes on the Earth's Surface" PPT
Part One: Observation and Thinking
What did you find out about the comparison?
One day in 1910, the young German meteorologist Wegener was in poor health and lay in bed. Out of boredom, his eyes fell on a world map on the wall. He unexpectedly discovered that the outlines of the two sides of the Atlantic Ocean were so corresponding. The right-angled protrusion at the eastern end of Brazil was very consistent with the Gulf of Guinea on the west coast of Africa, which was recessed into the continent. . Is this a random coincidence? Did the African continent and the South American continent once stick together, and then they broke apart, drifted apart?
At the beginning of the 20th century, Wegener collected various evidences and proposed the theory of continental drift, pointing out that North America and Eurasia were once spliced together to form Laurasia, separated by the ancient Mediterranean Sea, and Antarctica, Australia, India, Africa and South America in the south. The amalgamated continents of Gondwana faced each other, and the continents later moved to their current positions.
Part Two: Content Analysis
fossil
Fossils are the remains of ancient organisms (such as animal bones, hard shells, etc.) or remains (such as animal footprints, insect burrows, eggs, feces, etc.) preserved in rock formations. Fossils can tell us a lot of information about the history of the earth and biological evolution, and play an important role in scientific research.
Beijing-Hangzhou Grand Canal
The Beijing-Hangzhou Grand Canal is a great water conservancy project in ancient China. It is also the earliest and longest grand canal in the world. It starts from Hangzhou, Zhejiang Province in the south and ends at Beiguan, Tongzhou District, Beijing in the north. It is 1,794 kilometers long, runs through six provinces and cities, and flows through the five major water systems of Qiantang River, Yangtze River, Huaihe River, Yellow River and Haihe River. For more than a thousand years, it has been the main artery of transportation between the north and the south of our country, promoting the development of various industries such as commerce, culture, and services.
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"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware 3:
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"The Impact of Human Activities on the Earth's Surface" Changes in the Earth's Surface PPT Courseware 2:
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