When scientists analyzed drilling samples from the Glomar Challenger study which Discovery did they make about rocks in relation to a mid-ocean ridge?
The Glomar Challenger was a drilling ship built in 1968 to gather samples from the ocean floor. The study found that the more distant away from a ridge the samples were obtained, the older the rocks were. Therefore, the youngest rocks were always in the closer to the ridges.
What information did the Glomar Challenger study in 1968?
ANSWER: Glomar Challenger studies about the “age of rocks in various places in the ocean” in 1968. EXPLANATION: Glomar Challenger was a “deep sea research vessel” for marine geology and oceanography studies.
What theories did Glomar Challenger help confirm?
Purpose. Glomar Challenger was made to help Harry Hess with the theory of Seafloor Spreading by taking rock samples confirming that the farther from the Mid-ocean ridge, the older the rock was.
Is the crust near a divergent boundary older or younger than the crust farther away from the boundary?
Over millions of years, tectonic plates may move many hundreds of kilometers away from both sides of a divergent plate boundary. Because of this, rocks closest to a boundary are younger than rocks further away on the same plate.
Where is the oldest crust found in a divergent boundary?
The oldest parts of the oceanic crust are found farest from the mid ocean ridges at subduction zones and continental shelves.
What is a real life example of a divergent boundary?
Divergent boundaries occur where two plates move apart from each other. This happens at the mid-ocean ridges, where seafloor spreading and volcanic activity continuously add new oceanic crust to the oceanic plates on both sides. Examples are the Mid-Atlantic Ridge and East Pacific Rise.
What happens to the crust at a transform boundary?
Transform plate boundaries are different from the other two types of plate boundaries. At divergent plate boundaries, new oceanic crust is formed. At convergent boundaries, old oceanic crust is destroyed. But at transform plate boundaries, crust is neither created nor destroyed.
Why do earthquakes happen at transform boundaries?
Shallow‐focus earthquakes occur along transform boundaries where two plates move past each other. The earthquakes originate in the transform fault, or in parallel strike‐slip faults, probably when a frictional resistance in the fault system is overcome and the plates suddenly move.
Why do transform boundaries move?
Transform boundaries are areas where the Earth’s plates move past each other, rubbing along the edges. As the plates slide across from each other, they neither create land nor destroy it. Because of this, they are sometimes referred to as conservative boundaries or margins.
Are transform boundaries constructive or destructive?
Accordingly, this type of ocean transform fault forms an integral part of constructive plate boundaries, and their position is made obvious by the jagged shape of parts of the ocean-ridge system that are split into several segments by series of so-called fracture zones.
Why is it called destructive boundary?
Constructive plate boundaries are when there are two plates moving apart from each other. They are called constructive plates because when they move apart, magma rises up in the gap- this forms volcanoes and eventually new crust. Destructive plate boundaries are when oceanic and continental plates move together.
What is the most dangerous plate boundary?
At convergent plate boundaries, where two continental plates collide earthquakes are deep and also very powerful. In general, the deepest and the most powerful earthquakes occur at plate collision (or subduction) zones at convergent plate boundaries.
Which boundaries are destructive and which are constructive?
A constructive plate boundary occurs when two plates move away from each other. Find out more about constructive plate margins. A destructive plate boundary occurs when an oceanic plate is forced under (or subducts) a continental plate.
What is an example of a constructive plate boundary?
Constructive (tensional) plate margins occur where plates move apart. Examples below include the South American Plate and African Plate and the Eurasian Plate and the North American Plate. Iceland was formed as the result of sea floor spreading in the North Atlantic.
What direction do destructive plates move?
Destructive plate margins The plates move towards one another and this movement can cause earthquakes. As the plates collide, the oceanic plate is forced beneath the continental plate. This is known as subduction . This happens because the oceanic plate is denser (heavier) than the continental plate.
What happens when two plates are moving apart?
A divergent boundary occurs when two tectonic plates move away from each other. Along these boundaries, earthquakes are common and magma (molten rock) rises from the Earth’s mantle to the surface, solidifying to create new oceanic crust. When two plates come together, it is known as a convergent boundary.