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During the beginning of the Cenozoic Era, all the continents were connected together in one large land mass known as Pangea. The Cenozoic period began about 65 million years ago with the extinction of the dinosaurs and continues through the present. The continents have broken apart, and the Atlantic Ocean has opened from a narrow valley to a vast ocean. India moved across the ocean and collided with Asia to form the Himalayas. The western coasts of North and South America crumpled to form the Rocky Mountains and the Andes.

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