How did the Red Sea shown between Arabia and Africa in this figure form?
How did the Red Sea, shown between Arabia and Africa in this figure, form? Continental Rifting followed by seafloor spreading.
What causes magnetic stripes on the seafloor such as those shown here?
At the mid-ocean ridge spreading axis, these flips in the direction of the Earth's magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
When two oceanic plates converge a curved belt of volcanic islands called an island?
A subduction zone is also generated when two oceanic plates collide — the older plate is forced under the younger one — and it leads to the formation of chains of volcanic islands known as island arcs.
How fast do plates move relative to one another quizlet?
How fast do tectonic plates move? They move at speeds ranging from 1 to 16 cm (0.4 to 6.3 in) per year.
Which letter is over the youngest oceanic crust?
30 Cards in this Set
| How did the Red Sea, shown between Arabia and Africa in this figure form? | Continental rifting followed by seafloor spreading |
|---|---|
| Where is subduction occurring on this map of South America? | B |
| On the accompanying figure, which letter is over the youngest oceanic crust? | D |
Is the Red Sea oceanic or continental?
Abstract. (1) The northern Red Sea is an amagmatic continental rift in which an oceanic spreading center is beginning to develop.
How do magnetic stripes form on the ocean floor?
Since the oceanic crust contains iron in it, the way the rocks on the ocean floor hardened on both sides of the mid-ocean ridges are influenced by the direction of the magnetic field. As a result, it forms a pattern that resembles stripes that are alternately pointed north and south.
When two tectonic plates collide the oceanic crust usually subducts beneath the continental crust Why is this so?
When an oceanic plate converges with a continental plate, the oceanic crust will always subduct under the continental crust; this is because oceanic crust is naturally denser. Convergent boundaries are commonly associated with larger earthquakes and higher volcanic activity.
What is the boundary form where two plates bump into each other?
When two plates come together, it is known as a convergent boundary. The impact of the colliding plates can cause the edges of one or both plates to buckle up into a mountain ranges or one of the plates may bend down into a deep seafloor trench.
Where is the oldest oceanic crust?
the eastern Mediterranean Sea The oldest patch of undisturbed oceanic crust on Earth may lie deep beneath the eastern Mediterranean Sea – and at about 340 million years old, it beats the previous record by more than 100 million years.
Where is oceanic crust youngest?
mid ocean ridges The age of oceanic crust in millions of years. The youngest crust (shown in red) is near mid ocean ridges and spreading zones. All three rock types in the earth's crust—igneous, sedimentary, and metamorphic—can also be recycled back to their original molten magma form.
How old is the Red Sea?
The Gulf of Suez opened up about 30 million years ago, and the northern part of the Red Sea about 20 million years ago.
Why is it called Red Sea?
The Red Sea is the saltiest sea of all the seas that connect to the ocean without even one river meeting the sea. A popular hypotheses about the origins of the Red Sea's name is that it contains a cyanobacteria called Trichodesmium erythraeum, which turns the normally blue-green water a reddish-brown.
Which type of material becomes molten rock at subduction zones quizlet?
Which type of material becomes molten rock at subduction zones? Which event causes the formation of trenches in Earth's crust? Which statement accurately describes one aspect of plate tectonics that involves subduction and seafloor spreading? – Older crust is melted at subduction zones.
What prominent sea floor feature is found in the central Atlantic Ocean?
The Mid-Atlantic Ridge The Mid-Atlantic Ridge is located at the juncture of crustal plates that form the floor of the Atlantic Ocean; it is considered a "slow-spreading" ridge by earth scientists.
What is formed on top of plate B?
what is formed on top of plate B? Answer: Magma rise up on top of plate B to form volcanoes. As the leading edge of plate A subducted beneath plate B, it move towards the mantle and melts when it reaches the mantle due to high temperature in the mantle.
When two tectonic plates collide the continental crust usually rise up over the oceanic crust because it is?
Oceanic crust is typically denser than continental crust and is forced downwards into the hot mantle when it collides with continental crust. The less dense conitinental crust is forced upward. This occurred in Ireland with the closure of the Iapetus Ocean over 450 million years ago.
Which plate boundary and movement commonly create non volcanic mountains explain how non volcanic mountains are created by plate tectonics?
Answer and Explanation: The convergent boundary is one where the impact of the two plates towards one another results in the formation of non-volcanic mountains.
What is the oldest crust?
Earth's oldest known piece of continental crust dates to the era of the moon's formation. Australia holds the oldest continental crust on Earth, researchers have confirmed, hills some 4.4 billion years old.
Which is the oldest ocean?
The Pacific The Pacific is the oldest of the existing ocean basins. Its oldest rocks have been dated at about 200 million years.
What is the oldest oceanic crust?
340 million years old Herodotus Basin is thought to be 340 million years old Now, this region, called the Herodotus Basin, has been shown to be 340 million years old—the oldest ocean crust on Earth that remains under the sea, according to a study published online today in Nature Geoscience .
Where is the oldest oceanic crust located?
The oldest patch of undisturbed oceanic crust on Earth may lie deep beneath the eastern Mediterranean Sea – and at about 340 million years old, it beats the previous record by more than 100 million years.
Is Black Sea Black in colour?
The Black Sea is lying between Asia and Europe. It is surrounded by six countries; Romania and Bulgaria in the west, Georgia and Russia in the east, Ukraine in north and Turkey in the south. Name of the “Black Sea” due to dark the color of water.
Can you swim in the Black Sea?
With a clean freshwater surface, swimming in the Black Sea is possible; though offer a different experience from other water bodies. With its strange features, including the high level of minerals and salt, normally the objects tend to float on the water.
What type of boundary is located in the northwestern United States and forms the Cascade ranges?
convergent plate boundary The Cascadia Subduction Zone, extending from northern California through western Oregon and Washington to southern British Columbia, is a type of convergent plate boundary. Two parallel mountain ranges have been forming as a result of the Juan de Fuca Plate subducting beneath the edge of North America.
Where is the oldest crust found?
Australia holds the oldest continental crust on Earth, researchers have confirmed, hills some 4.4 billion years old.
Where is the oldest crust found in relation to the mid-ocean ridge?
The oldest parts of the oceanic crust are found farest from the mid ocean ridges at subduction zones and continental shelves.
Which letter represents the location of the Mid-Atlantic Ridge?
The Mid-Atlantic Ridge is located between zones B and C. Which graph best represents the geologic age of the surface bedrock on the ocean bottom? 57.
What type of plate is B?
ANSWER: Plate A is an oceanic plate because it is relatively thinner compared to Plate B. While Plate B is a continental plate because it is thicker and floats higher than the other plate.
What is formed on the top of the edge of the subducting oceanic plates?
Magma formed above a subducting plate slowly rise into the overriding crust and finally to the surface forming a volcanic arc, a chain of active volcanoes which parallels the deep ocean trench.