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A lot of shells of marine organisms wind up on the ocean floor. Bones do not last on the ocean floor, they get eaten. But shells can last.
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∙ 10y ago
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When two of earths ocean plates collide they can form a deep valley called?
trench- valleys that form on the ocean floor where two plates come together, the deepest place in the ocean
Can both volcanoes and earthquakes form on the ocean floor?
yes
What is used as evidence for sea-floor spreading-?
The rocks on either side of a mid-ocean ridge record the direction of the Earth's magnetic field at the time they were formed, and form a pattern of 'magnetic stripes' on either side of the ridge which are symmetrical. It is also now possible to measure ocean widths with sufficient accuracy to show yearly changes.
When magma rises up through the sea floor rifts and cools to form ocean floor?
yes
How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading?
Strips of ocean-floor basalt record the polarity of earth's magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge. the pattern shows that ocean floor forms along mid-ocean ridges and then moves away from the ridge.
When two of earths ocean plates collide they can form a deep valley called?
trench- valleys that form on the ocean floor where two plates come together, the deepest place in the ocean
How does new ocean floor form?
Sea Floor Spreading!
What forms features on the ocean?
What causes ocean floor features to form
Why do fossils form?
Organic things get buried in locations favourable for the formation of fossils (stream deltas, ocean floor.) The mud (or whatever) forms a hard cast about the thing. The thing then decomposes and gets flushed away. The hole fills with a mineral the local water is rich in. This is a fossil.
What causes material to form at a mid-ocean ridge on the ocean floor?
New material forms on the ocean floor of the mid-ocean ridge due to plate tectonics and volcanic activity. Volcanic eruptions deposit cooled magma on the ocean floor.
Can both volcanoes and earthquakes form on the ocean floor?
yes
What cause new material to form at a mid ocean ridge on the ocean floor?
New material forms on the ocean floor of the mid-ocean ridge due to plate tectonics and volcanic activity. Volcanic eruptions deposit cooled magma on the ocean floor.
When metals concentrate around pieces of shell on the ocean floor they form black lumps called?
they are called organic spots on the ocean floor.
What can form fossils?
Many fossils form because an animal dies and its body sinks to the ocean floor where it is buried in sediment. The bone sinks in the sediment and more is added on top. As the pressure increases the sediment turns into rock. The bone then dissolves from water and leaves a hole in its place. This natural mold is filled with minerals from the water. The area surrounding the fossil is then brought back to the surface after millions of years of erosion.
What is used as evidence for sea-floor spreading-?
The rocks on either side of a mid-ocean ridge record the direction of the Earth's magnetic field at the time they were formed, and form a pattern of 'magnetic stripes' on either side of the ridge which are symmetrical. It is also now possible to measure ocean widths with sufficient accuracy to show yearly changes.
Where do deep currents flow along in the ocean?
deep ocean currents form by the differences in the density of ocean water
Why is there more fossils of aquatic organisms than land dwelling organisms?
Because i think there is more ocean than the land ; and ocean animals died more .,,
