What is the place where the seafloor is forced down into the mantle?
Ocean-Ocean When two oceanic plates converge, the older, denser plate will subduct into the mantle. An ocean trench marks the location where the plate is pushed down into the mantle. The line of volcanoes that grows on the upper oceanic plate is an island arc.
Where one oceanic plate is forced down into the mantle beneath a second plate?
Science Chapter 9
| A | B |
|---|---|
| Destructive plate margins called____________ are where one oceanic plate is forced down into the mantle beneath a second plate. | subduction zones |
| Where two plates collide, ________________ occur. | convergent boundaries |
What are the places called where new seafloor is being created?
mid-ocean ridge — a continuous mountain chain on the floor of all major ocean basins which marks the site where new ocean floor is created as two lithospheric plates move away from one another.
How is oceanic crust forced back into the Earth’s mantle?
How is oceanic crust forced back into the earth’s mantle? It wants to float but is forced under by colliding plates. It wants to sink because it is made of high density minerals. It wants to sink because it is cold and therefore dense.
What were the continents before Pangea?
Between roughly 750 million and 550 million years ago these ocean basins were destroyed, and all the Precambrian nuclei of Africa, Australia, Antarctica, South America and India amalgamated into the supercontinent of Gondwana.
Why is it called Laurasia?
The name combines the names of Laurentia and Eurasia. Although Laurasia is known as a Mesozoic phenomenon, today it is believed that the same continents that formed the later Laurasia also existed as a coherent supercontinent after the breakup of Rodinia around 1 billion years ago.
What is the meaning of laurasia?
noun Geology. a hypothetical landmass in the Northern Hemisphere near the end of the Paleozoic Era: split apart to form North America and Eurasia.
How do you pronounce panthalassa?
Phonetic spelling of panthalassa
- pan-tha-las-sa. Gloria Hammes.
- păn′thə-lăs′ə
- Pan-tha-lassa.
- P-anthalassa. Rosetta Rath.
What was Pangea’s ocean called?
Panthalassa
What does panthalassa mean in English?
[ păn′thə-lăs′ə ] The ocean that surrounded the supercontinent Pangaea.