HarrisonGrey

__The Dawn Of The Dinosaurs__ (The Cretaceous Period) By: Harrison Grey When you think Cretaceous, you think Dinosaurs. However the largest dinosaurs thrived during the Jurassic period. When Pangaea continued to break apart. Sea levels rose and the very first birds along with flying reptiles appear. So you think that since the Cretaceous period doesn’t have big dinosaurs it isn’t cool… wrong again. During the Cretaceous period the continents moved toward where they are today. Volcanic activity occurs throughout the continents. The first flowering plants appeared, while dinosaurs dominate. Snakes open their eyes to the world and survive through a mass extinction that completely wiped out all dinosaurs. Then the tertiary period came, the most famous mountains we see today started to form, such as the Rockies and the Alps. Glaciers covered Antarctica about 25 million years ago, just like they do today. Flowering plants developed into extreme plants. Grasses and mammals developed. Primates such as horses and elephants appear. Mammals return to the ocean in forms of whales and dolphins. Ancestors of you and I develop into hominids. Glaciers cover part of North America about 2.5 million years ago. You see… the Cretaceous period is cool, along with the Jurassic and the Tertiary.