Subduction
What is subduction?
One tectonic plate slides under another
Sea-floor spreading helps explain this slow movement of Earth’s continents over millions of years.
What is Continental Drift?
As magma rises and cools at mid-ocean ridges, it forms these, creating elevated oceanic ranges.
What is New Crust?
The longest mountain range in the world, located on the ocean floor.
What is the Mid-Atlantic Ridge?
what causes subduction???
Usually happens when an oceanic plate meets a continental or another oceanic plate.
As new ocean crust forms at mid-ocean ridges and moves outward, it acts like this for the tectonic plates.
What is a Conveyor Belt?
The alignment of magnetic minerals in the oceanic crust reveals symmetrical patterns on either side of mid-ocean ridges, supporting sea-floor spreading.
What is Paleomagnetism (Magnetic Stripes)?
True or false: Pillow lava rocks did not prove sea floor spreading.
False
What is a deep-ocean trench???
a deep underwater canyon
Sea-floor spreading provides the driving force behind this major Earth science theory that unites continental drift and subduction.
What is the Theory of Plate Tectonics?
The magnetic stripes on both sides of the mid-ocean ridge show these types of patterns, indicating Earth's magnetic field reversals.
What are Symmetrical Magnetic Stripes?
This country is home to a significant portion of the Mid-Ocean Ridge, where sea-floor spreading is active.
What is Iceland?
true or false: The process of of subduction can change the size and shape of oceans.
true
The movement of tectonic plates caused by sea-floor spreading helps explain these sudden, often destructive events along plate boundaries.
What are Earthquakes?
This phenomenon suggests that oceanic crust gets older as you move away from mid-ocean ridges.
What is the Age of Rocks?
This type of rock is commonly found at mid-ocean ridges and is formed as magma cools.
What is Basalt?
true or false the Pacific ocean is spreading???
false
The interactions of moving plates at convergent and divergent boundaries cause these two major geologic processes that build Earth’s surface features.
What are Volcanic Activity and Mountain Building?
As you move farther from mid-ocean ridges, sediment thickness increases, indicating that this has more time to accumulate.
What is the Thickness of Sediments?
This underwater feature is formed when magma rises from the mantle at a mid-ocean ridge and cools.
What is a Rift Valley?