- What kind of rock is the seafloor made of?
- Where is the seafloor oldest?
- Which is the oldest continent on earth?
- Where are the youngest sediments found?
- What is the importance of seafloor spreading?
- When did seafloor spreading start?
- What are the evidence of seafloor spreading?
- How is seafloor destroyed?
- How was seafloor spreading discovered?
- Is seafloor destroyed?
- Which boundaries is seafloor created?
- How old is the oldest oceanic crust on Earth?
What kind of rock is the seafloor made of?
igneous rockAs old oceanic crust is subducted and melted into magma, new oceanic crust in the form of igneous rock is formed at mid-ocean ridges and volcanic hotspots..
Where is the seafloor oldest?
Mediterranean SeaThe oldest seafloor is comparatively very young, approximately 280 million years old. It is found in the Mediterranean Sea and is a remnant of an ancient ocean that is disappearing between Africa and Europe.
Which is the oldest continent on earth?
AustralianThe Australian continent, being part of the Indo-Australian Plate (more specifically, the Australian Plate), is the lowest, flattest, and oldest landmass on Earth and it has had a relatively stable geological history.
Where are the youngest sediments found?
Where are the youngest sediments found, compared to the Mid-Atlantic Ridge? It is youngest at the opening of the ridge.
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.
When did seafloor spreading start?
1960The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in 1960.
What are the 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 is seafloor destroyed?
Framework Integration: Themes: Patterns of change: over time, new sea-floor is created by the upwelling of magma at mid-ocean spreading centers; old ocean floor is destroyed by subduction at deep sea trenches.
How was seafloor spreading discovered?
Hess discovered that the oceans were shallower in the middle and identified the presence of Mid Ocean Ridges, raised above the surrounding generally flat sea floor (abyssal plain) by as much as 1.5 km. … This created new seafloor which then spread away from the ridge in both directions.
Is seafloor destroyed?
The seafloor certainly does disappear at subduction zones along the Ring of Fire. Here, the seafloor (and all the oceanic crust beneath it) plunges down under the continents into Earth’s mantle, to be recycled.
Which boundaries is seafloor created?
Seafloor spreading occurs at divergent plate boundaries. As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor.
How old is the oldest oceanic crust on Earth?
about 340 million yearsThe 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.