In sea-floor spreading,
the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added
. … Several types of evidence supported Hess’s theory of sea-floor spreading: eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves.
What is the theory of seafloor spreading?
Seafloor spreading is a geologic process in which tectonic plates—large slabs of
Earth’s lithosphere—split apart from each other
. … As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense.
What is a seafloor spreading quizlet?
Seafloor Spreading.
The process by which molten materials add new oceanic crust to the ocean floor
. Deep Ocean Trench. A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
Which of the following is evidence of seafloor spreading?
Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that
basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached
, and the sediment cover is thinner near the ridge.
How does seafloor spreading occur quizlet?
What is seafloor spreading? The process of molten material from the mantle being pushed upward to the surface of the earth and spreading apart creating new earth. Where does seafloor spreading occur? This process occurs
along divergent plate boundaries at areas called mid-ocean ridges
.
What are the 3 evidences of seafloor spreading?
Evidence of Sea Floor Spreading. Harry Hess’s hypothesis about seafloor spreading had collected several pieces of evidence to support the theory. This evidence was from the investigations of
the molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes
.
What are the three types of seafloor spreading?
There are three types of plate-plate interactions based upon relative motion: convergent, where plates collide,
divergent
, where plates separate, and transform motion, where plates simply slide past each other.
What is the first step of seafloor spreading quizlet?
1.
A long crack in the oceanic crust forms at a mid ocean ridge
. 2. Molten material rises and erupts along the ridge.
What are the 4 steps of seafloor spreading?
- Magma comes out of the rift valley.
- Magma cools to rock and hardens.
- Rock is pushed away as new rock is formed at MOR.
- Oceanic crust and continental crust meet at the trench.
- Oceanic crust bends down under the continental crust.
- Gravity pulls rock towards mantle.
- Rock melts to mantle.
What is the first step in seafloor spreading process?
As the seafloor spreading occurs, the continents move. How does oceanic crust move along mid-ocean ridges? Which is the first step in the seafloor spreading process?
A crack forms in oceanic crust.
What is the importance of seafloor spreading?
Significance. Seafloor spreading
helps explain continental drift in the theory of plate tectonics
. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere.
What are the features of seafloor?
Features of the ocean include
the continental shelf, slope, and rise
. The ocean floor is called the abyssal plain. Below the ocean floor, there are a few small deeper areas called ocean trenches. Features rising up from the ocean floor include seamounts, volcanic islands and the mid-oceanic ridges and rises.
What is evidence of seafloor spreading Brainly?
There is lots of evidence that proves that seafloor spreading is occurring. One piece of evidence is
mid-ocean ridges
. Rocks found near mid-ocean ridges are young and get older as the distance from the ocean ridge increases.
Where does seafloor spreading start?
Sea floor spreading begins at
the mid ocean ridge
which forms a crack in the oceanic crust. This allows molten material to rise and form new rock. At the same time older rock move outwards and onto the sides of the ridge. the process by which ocean floor sinks beneath a deep ocean trench and back into the mantle.
Who discovered seafloor spreading?
Harry Hess
: One of the Discoverers of Seafloor Spreading.
What types of advancements in technology and science led to the development of the theory of seafloor spreading?
In particular, four major scientific developments spurred the formulation of the plate-tectonics theory: (1) demonstration of the ruggedness and youth of the ocean floor; (2) confirmation of repeated reversals of the Earth magnetic field in the geologic past; (3) emergence of the seafloor-spreading hypothesis
and
…
