AP BIOLOGY

Detailed explanation-1: -About 300 million years ago, Earth did not have seven continents, but instead one massive supercontinent called Pangaea, which was surrounded by a single ocean called Panthalassa. Later, the crust and top part of the mantle were broken up into two supercontinents called Laurasia and Gondwana.

Detailed explanation-2: -Pangaea. This illustration represents Pangaea, the supercontinent that existed about 225 million years ago, a time when the dinosaurs were first establishing themselves as a life form on Earth.

Detailed explanation-3: -In 1912, German scientist Alfred Wegener proposed that Earth’s continents once formed a single, giant landmass, called Pangaea. Over millions of years, Pangaea slowly broke apart, eventually forming the continents as they are today.

Detailed explanation-4: -The most frequently referenced supercontinent is known as “Pangaea” (also “Pangea"), which existed approximately 225 million years ago. It is thought that all major continents at that time were assembled into the Pangaea supercontinent.

Detailed explanation-5: -Pangea’s existence was first proposed in 1912 by German meteorologist Alfred Wegener as a part of his theory of continental drift. Its name is derived from the Greek pangaia, meaning “all the Earth.”