Formation
Formed at convergent boundaries, denser plate goes underneath other overlying plate and this is formed at the contact point.
What are trenches?
Deep rumbling in the ground varying in severity sometimes followed by tsunamis and landslides
What are the features of an earthquake?
Series of high speed, large ocean waves with extremely long wavelengths can can be extremely destructive.
What is the definition of a tsunami?
Damage to coastal environments and cities. Power outages, flooding.
What are the effects of tsunamis?
Crust is neither created nor destroyed.
What are transformation Plates?
Formed at divergent boundaries. The upward movement of underlying magma comes to the surface of the crust and cools/solidifies, forming new crust.
What are Mid-Ocean Ridges?
Fast moving in deep water, once by the surface the front wave slows down, while the back wave keeps its constant speed, resulting in a "wall".
What are the features of a tsunamis?
Continuous underwater volcanic mountain range.
What is the definition of a Mid-Ocean Ridge?
Earthquakes and trenches
What are the effects of convergent boundaries?
New crust is created
What are Divergent Plate Boundaries?
Formed when molten magma is forced upward above earths crust. The magma eventually solidifies, forming uneven crust. Fine grain sediments are carried to seafloor, eventually settle to flat surfaces.
What are Abyssal Plains?
Thinning of crust where gases and molten lava escape.
What are the features of a divergent volcano?
Long, narrow, and deepest part of the ocean floor.
What is the definition of a trench?
Submarine Mountain ranges, volcanic activity, shallow earthquake activity, and formation of new seafloor
What are the effects of divergent boundaries?
Crust is destroyed.
What are convergent plate boundaries?
There are 2 types. One is formed at the opening at the earths crust where gases and molten rock escape. The other type is formed where 2 plates collide and the subducted plate heats up, causing magma to rise.
What are volcanoes?
Found along mid-ocean ridges at very deep depths of over 2000 m. Extremely high pressure and and temperature.
What are the features of Hydrothermal Vents?
Flat area on ocean floor where fine grained sediments are carried to seafloor from continental margins by turbidity currents.
What is the definition of an Abyssal Plain?
Influences sea level. As oceanic crust moves away from shallow mid ocean ridges, it cools and sinks, becoming more dense. This increases the volume of the ocean basin and decreases the sea level.
What are the effects of seafloor spreading?
This is the outer crust layer of the earth that consists of a number of different plates.
What is the lithosphere?
As seafloor spreads away from ridge, cracks and fissure forms resulting in cold water seeping from them. The water is then heated by the hot underlying magma, resulting in minerals being dissolved, and forced back to ocean floor. As the water cools, the dissolved minerals precipitate.
What are hydrothermal vents?
Only in convergent boundaries, 2 plates collide and one subducts. The subducted one heats up and magma rises to the surface.
What are the features of a convergent volcano?
Opening of the seafloor where heated mineral-rich water flows.
What is the definition of hydrothermal vents?
Helps maintain the oceans chemistry by rearranging the seawaters chemical composition.
What are the effects of hydrothermal vents?
Bands show normal and reversed polarity. The Magnetic properties in the bands are symmetrical. Also, overtime the magnetic poles reverse causing the mineral alignment to reverse as well.
What evidence supports seafloor spreading?