coastal boundary
Transform boundary
how were the salt mines formed millions of years ago.
the himalyas were fromed hundereds of years ago
When those two continients split 65 million years ago what were formed
Pangaea formed about 300 million years ago and began to rift about 200 million years ago.The formation and falling apart of super continents appears to be cyclical. Pangaea is the fourth super continent in Earth's history.Known super continents:Columbia (2 billion years to 1.8 billion years ago)Rodinia (1.1 billion years ago to 750 million years ago)Pannotia (600 million years ago to 540 million years ago)Pangea (300 million years ago to 200 million years ago)
There are three calderas within the boundaries of the park itself. The oldest and largest is only partially within the park. This one formed 2.1 million years ago during the first super eruption of the Yellowstone volcano. The second and most famous formed 640,000 years ago in the third and most recent super eruption. There is a third, smaller caldera that was formed by a much smaller, though still very large eruption about 173,000 years ago. There is another caldera in this complex to the west of the park boundaries. This was formed in the second super eruption 1.3 million years ago.
The Giant's Causeway was formed approximately 50-60 million years ago during a period of intense volcanic activity.
Pangaea formed around 335 million years ago during the late Paleozoic and early Mesozoic eras. It began to break apart around 175 million years ago during the Jurassic period.
4560 million years ago
No, try over 60 million years ago.
The eastern mountains are older. The Appalachians formed between 300 million and 250 million years ago. The Rockies formed between 80 million and 50 million years ago.
Most chalk was formed in the Cretaceous period, from about 138 million to 65 million years ago.