Recent excavations have shed more light on the theory that certain dinosaurs originated in South America and crossed Antarctica nearly 100 million years ago to arrive in Australia. According to the article, the dinosaurs would have been able to make the journey over frozen lands at the time, when the earth's atmosphere was warmer than today. The attached video is about dinosaur fossils in Bolivia. Suggested Set: The United States investigates whale deaths Video Vocabulary:

تحول إلى ، يتحول إلى	To turn into	المحميات الطبيعية	Nature reserves
يحتوي على	It contains	لانزلاق التربة	Sliding of soil
آثار أقدام الديناصورات	Dinosaur footprints	إحصاء	counting

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