Why can dinosaur fossils be found in Antarctica?

Because 200 million years ago, it was the age when dinosaurs lived. At that time, the six major plates were connected together, collectively known as "Pan-continent". Because of plate drift, by 65 million years ago, the six major plates split, and the Antarctic plate in the south drifted south to the South Pole. Dinosaurs on the plate became fossils because of the gradual cooling of temperature or earthquakes and volcanoes caused by crustal movement.

Supplementary answer: Practice notes.

1. These two short articles are all about the extinction of dinosaurs, but the materials used are different and the main problems expounded are different. Try to make a concrete analysis according to the text.

The purpose of designing this topic is to make students think about the problems involved in the two short passages on the basis of reading through the text, compare and analyze their respective explanatory objects and angles, and deepen their understanding of the text. Both articles talked about the extinction of dinosaurs. The first essay talks about the ubiquity of dinosaur fossils in order to prove the correctness of another scientific theory ("plate tectonics" theory). In the second article, the extinction of dinosaurs became the subject of discussion, and "broken sand" became evidence. This shows that the author has a scientific thinking method of looking at problems from multiple angles and sides.

Secondly, the following statement is a supplementary explanation that the author puts in brackets in his writing. Try to talk about their respective functions in context.

Frogs and toads are famous modern amphibians.

If you look at a map, suppose Africa and South America are put together, you will find how seamlessly they are put together.

In case a star hits the earth one day, we may know how to avoid this collision.

4. Very pure sand.

You can also heat the diamond in vacuum to restore it to its original carbon state, but who wants to do so?

The purpose of designing this question is to make students understand the different functions and significance of supplementary explanations in the text.

Question 1, if we talk about modern amphibians in the abstract and don't give examples, readers may not know which animals they are referring to at the moment. There are many modern amphibians, such as frogs and toads, because they are "well known" and people are very familiar with them. Frogs and toads can't live in Antarctica, just as dinosaurs can't adapt to the ecological climate in Antarctica, because they are both amphibians.

Question 2: This sentence supplements one of the most obvious evidences of the continental drift theory, that is, the striking coincidence of the coastlines of South America and Africa can not be explained by coincidence, but only shows that they were originally together. Of course, there are many deep evidences of continental drift theory (see "related information" section).

Question 3, this is a quip, but it's not nonsense. Although it is extremely rare for a star to hit the earth, it did happen in the history of the earth. The author makes this assumption to emphasize the practical significance of astronomical research.

Question 4: This sentence is an explanation of "silicon dioxide". On the one hand, it is pointed out that "silica" is the scientific name of sand, on the other hand, it is emphasized that only very pure sand can be called "silica", and ordinary sand contains impurities.

Question 5, this sentence is that diamonds can be turned into ordinary carbon after being heated at high temperature, and can be turned into ordinary sand when heated at high temperature. Perhaps no one will care about the reduction of time, but no one will be willing to turn diamonds into carbon because diamonds are too expensive. The author's short essay is humorous, which also shows the author's active thinking.

Third, "different scientific fields are closely linked. New discoveries in one scientific field will certainly have an impact on other fields. " What does this passage inspire you? Can you give one or two examples from your own study or life experience to illustrate this point?

The purpose of setting this question is to connect students with their usual reading accumulation and life experience during study, so that students can gain something in their study and feel something; At the same time, it can cultivate students' thinking methods of looking at and thinking about problems from the perspective of connection.