The “Age of Dinosaurs” also known as the Mesozoic era began over 245 million years ago. It was divided into three periods that is the Triassic (245 to 208 million years ago), .Jurassic (208 to 145 million years ago), and the Cretaceous (145 to 66 million years ago). The earth during the Mesozoic era was very different than it is today. The earth was only one continent whereas today it is seven. This huge super-continent was called Pangea. During the Jurassic period, Pangea was separated into two continents known as Laurasia and Gondwanaland, and during the Cretaceous period, the continents as we know them today began to appear. An evidence show that at the beginning of the Triassic period, before the dinosaurs appeared, the global temperature of the earth was averaged around 50 degrees to 60 degrees Fahrenheit. At the end of the period, the temperature became hotter the humidity became drier. Deserts also began to appeal- Ginkgo trees and fern forests began to appear in the North Hemisphere.