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The trenches catch most of the sediment from the plates that break up and sink deeper into the water. This causes the upper plates to grow.
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What occurs at plate boundaries that are associated with seafloor spreading?
When seafloor spreading happens, a rift forms at the bottom of a ocean and separates to form new rock. This is an example of a divergent plate boundary
What is molten rock that flows onto the seafloor and hardens as it cools?
Lava
What happens when rock fall or slide down a cliff?
It falls and break
Why would you expext to find some volcanic rock in the Himalayas?
The volcanic rock would be a mafic rock pushed up from the seafloor as the continents collided.
What type of rocks from when magma erupts from undersea volcano?
All three rock types could be formed in areas under the seas. Two types of rock are most likely to form on the seafloor, however. Sedimentary rock is formed on the seafloor where accumulations of sediments undergo lithification processes. Extrusive igneous rock can form on the seafloor when lava erupts on its surface.
Explain how ocean-floor rocks and sediments are evidence of seafloor spreading?
The seafloor rocks vary in different places. Rock samples near ocean ridges are younger than rocks at deep sea trenches
What occurs at plate boundaries that are associated with seafloor spreading?
When seafloor spreading happens, a rift forms at the bottom of a ocean and separates to form new rock. This is an example of a divergent plate boundary
How does continental rock differ from seafloor rock?
Continental plates are massively granitic rock, oceanic plates massively basaltic rock, therefore continental rock is less dense than seafloor rock and has a different chemical and mineralogical composition.
Explain how an isochron map of the ocean floor supports the theory of seafloor spreading?
An isochron is a line on a map that connects points that have the same age. An isochron map of the ocean floor supports the theory of seafloor spreading because it shows the older rock near the deep sea trenches and the younger rocks near ocean ridges.
How does the age of seafloor sediments change with increasing distance from the ocean ridge?
Age of seafloor rock and sediment increases with distance from the oceanic ridges.
What are the flattest areas on the seafloor called?
rock bottom
What happens to rock after it breaks down?
it turns into sediment
What happens to the magna when it cool down?
It turns into rock.
What happens when magma is cooled down fast?
It will be an igneous rock
What is molten rock that flows onto the seafloor and hardens as it cools?
Lava
What happens to the sedimentary rock layers that first formed over the ancient rock?
they are pushed down
What happens to bits of rock when you water carrying them slows down?
erosion
