What type of rock is most likely dominant at mid ocean ridges?
basalt
What is crest of Mid Oceanic Ridge?
A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. This feature is where seafloor spreading takes place along a divergent plate boundary. The rate of seafloor spreading determines the morphology of the crest of the mid-ocean ridge and its width in an ocean basin.
Is the magnetic stripe pattern on each side of the oceanic ridge equal?
When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. As it cools it becomes permanently magnetized in the direction of the Earth’s magnetic field. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.
What is the magnetic stripes pattern represent?
Scientists discovered that the rock that makes up the ocean floor lies in a pattern of magnetized “stripes.” These stripes hold a record of reversals in Earth’s magnetic field. The rock of the ocean floor contains iron. The rock began as molten material that cooled and hardened.
What can you say about the ages of oceanic rocks near the Mid Atlantic Ridge Do the ages of oceanic rocks get older as you move away from the ridge?
Answer: The newest, thinnest crust on Earth is located near the center of mid-ocean ridge—the actual site of seafloor spreading. The age, density, and thickness of oceanic crust increases with distance from the mid-ocean ridge. Eventually, older oceanic crust encounters a tectonic boundary with continental crust.
Which rock acts like a compass when it hardens at the bottom of the ocean floor?
basalt magmas
What are the line of evidence that support the plate movement?
Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed. Some life “rode” on diverging plates, became isolated, and evolved into new species.
Does the thickness of ocean floor sediments decreases with distance from an ocean ridge?
The thickness of ocean-floor sediments decreases with distance from an ocean ridge.
What is the pattern seen in the ages of the seafloor?
What do you notice about the age pattern on the seafloor in the Atlantic Ocean (hint: look on each side of the middle)? The age pattern is symmetric. Youngest ages are at the middle of the pattern (on the oceanic ridges) and the seafloor grows older moving outwards to each side of the middle.