) 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.
October 29, 1929, was a dark day in history. Black Tuesday is the day that the stock market crashed, officially setting off the Great Depression. Unemployment skyrocketed--a quarter of the workforce was without jobs by 1933 and many people became homeless.