) After existing for 163 million years, the dinosaurs disappeared at the end of the Cretaceous Period, 66 million years ago. The Earth's appearance during the Mesozoic Era was quite different from its appearance today.The reason for the difference is that although the surface of our Earth seems rock solid, it is not. After existing for 163 million years, the dinosaurs disappeared at the end of the Cretaceous Period, 66 million years ago. The Earth's appearance during the Mesozoic Era was quite different from its appearance today.
When The World Was Black: The Untold History Of The Worldâs First Civilizations, Part One: Prehistoric Cultures (When The World Was Black: The Untold History Of The Worldâs First Civilizations #1) âIn this book, youâll learn about the history of Black people.
After nearly a decade of optimism and prosperity, the United States was thrown into despair on Black Tuesday, October 29, 1929, the day the stock market crashed and the official beginning of the Great Depression.