Pangaea existed about 240 million years ago. By about 200 million years ago, this supercontinent began breaking up. Over millions of years, Pangaea separated into pieces that moved away from one another. These pieces slowly assumed their positions as the continent we recognize today.
Today, scientists think that several supercontinents like Pangaea have formed and broken up over the course of the Earth’s lifespan. These include Pannotia, which formed about 600 million years ago, and Rodinia, which existed more than a billion years ago.
Answer:
500 million years ago
a chunk of the supercontinent Pannotia drifted north and split into three masses, forming Laurentia (present-day North America), Baltica (present-day northern Europe), and Siberia. In shallow waters, the first multicellular animals with exoskeletons appeared, and an explosion of life began.
300 million years ago
the landmass Laurentia collided with Baltica. The Appalachian mountains of eastern North America rose along the edges of the supercontinent, Pangea, and a climate shift thrust the Earth into an ice age.
200 million years ago
dinosaurs roamed the supercontinent Pangea, surrounded by the Panthalassic Ocean, the oceanic ancestor of the Pacific Ocean.
100 million years ago
Pangaea broke apart. The Atlantic Ocean poured in between Africa and the Americas. India broke away from the African continent, and Antarctica and Australia, still connected above sea level, were stranded near the South Pole.
By 50 million years ago
dinosaurs were extinct from the Earth. Continental fragments collided, pushing up mountain ranges still existing today. The collision of Africa into Europe gave rise to the Alps in Europe, and the collision of India into Asia formed the Himalaya. Birds and mammals began to expand in number and diversity.
Present Day
The formation of the isthmus connecting North and South America and the split of the Australian continent from Antarctica changed global ocean currents and climate. Ice sheets carved out the Great Lakes of the United States and Canada just 20,000 years ago. Since then, warmer temperatures have melted ice, and sea levels have risen.
Answers & Comments
Explanation:
Pangaea existed about 240 million years ago. By about 200 million years ago, this supercontinent began breaking up. Over millions of years, Pangaea separated into pieces that moved away from one another. These pieces slowly assumed their positions as the continent we recognize today.
Today, scientists think that several supercontinents like Pangaea have formed and broken up over the course of the Earth’s lifespan. These include Pannotia, which formed about 600 million years ago, and Rodinia, which existed more than a billion years ago.
Answer:
500 million years ago
a chunk of the supercontinent Pannotia drifted north and split into three masses, forming Laurentia (present-day North America), Baltica (present-day northern Europe), and Siberia. In shallow waters, the first multicellular animals with exoskeletons appeared, and an explosion of life began.
300 million years ago
the landmass Laurentia collided with Baltica. The Appalachian mountains of eastern North America rose along the edges of the supercontinent, Pangea, and a climate shift thrust the Earth into an ice age.
200 million years ago
dinosaurs roamed the supercontinent Pangea, surrounded by the Panthalassic Ocean, the oceanic ancestor of the Pacific Ocean.
100 million years ago
Pangaea broke apart. The Atlantic Ocean poured in between Africa and the Americas. India broke away from the African continent, and Antarctica and Australia, still connected above sea level, were stranded near the South Pole.
By 50 million years ago
dinosaurs were extinct from the Earth. Continental fragments collided, pushing up mountain ranges still existing today. The collision of Africa into Europe gave rise to the Alps in Europe, and the collision of India into Asia formed the Himalaya. Birds and mammals began to expand in number and diversity.
Present Day
The formation of the isthmus connecting North and South America and the split of the Australian continent from Antarctica changed global ocean currents and climate. Ice sheets carved out the Great Lakes of the United States and Canada just 20,000 years ago. Since then, warmer temperatures have melted ice, and sea levels have risen.
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