What causes the volcanoes and deep valleys of East Africa? They are young, active volcanoes built on a continental margin above a sinking slab of oceanic lithosphere.
- They are young, active volcanoes built on a continental margin above a sinking slab of oceanic lithosphere. What causes the volcanoes and deep valleys of East Africa? A continental rift along parts of the African continent beginning to slowly separate
Steep escarpments and East Africa’s deep lakes – like Lake Tanganyika – are the result of this slow spread. It would however still take millions of years before the split occurs. This process of continental breakup is strongly associated with volcanoes because, as the land splits, molten rock rises into the Earth’s crust.
Contents
- 1 Which of the following is an example of an active continent continent collision?
- 2 What causes the linear patterns associated with paleomagnetism on either side of mid oceanic ridges?
- 3 What is the name of the late Paleozoic supercontinent?
- 4 Where are new oceanic crust and lithosphere formed?
- 5 What are the 4 lines of evidence for continental drift?
- 6 Which parts of Pangaea broke apart first?
- 7 Where is active seafloor spreading today?
- 8 What is a typical rate for seafloor spreading?
- 9 What drives plate tectonic movement?
- 10 Where does seafloor spreading occur?
- 11 Who proposed the theory of seafloor spreading?
- 12 What does Pangea mean?
- 13 What are the 3 components of lithosphere?
- 14 What small changes does the lithosphere make on a regular basis?
- 15 Which part of the lithosphere is the thinnest?
Which of the following is an example of an active continent continent collision?
Cards
| Term _______was the flora that was widely distributed throughout the once contiguous,, late Paleozoic Southern Hemisphere landmass. | Definition Glossopteris |
|---|---|
| Term The is an example of an active, continent-continent collision? | Definition northern movement of India into Eurasia |
What causes the linear patterns associated with paleomagnetism on either side of mid oceanic ridges?
What causes the linear patterns associated with paleomagnetism on either side of mid – oceanic ridges ? Normal and reversed magnetized strips roughly parallel to the ridge . Sinking of oceanic lithosphere into the mantle at a subduction zone.
What is the name of the late Paleozoic supercontinent?
Pangea
Where are new oceanic crust and lithosphere formed?
Oceanic crust is continuously being created at mid-ocean ridges . As plates diverge at these ridges, magma rises into the upper mantle and crust. As it moves away from the ridge , the lithosphere becomes cooler and denser, and sediment gradually builds on top of it.
What are the 4 lines of evidence for continental drift?
They based their idea of continental drift on several lines of evidence : fit of the continents , paleoclimate indicators, truncated geologic features, and fossils.
Which parts of Pangaea broke apart first?
About 200 million years ago, the supercontinent began to break up. Gondwana (what is now Africa, South America, Antarctica, India and Australia) first split from Laurasia (Eurasia and North America). Then about 150 million years ago, Gondwana broke up.
Where is active seafloor spreading today?
Where is active sea floor spreading occurring today ? Seafloor spreading is the movement of old rock that is being pushed by the new young oceanic crust. This would be a divergent since the plates are separating from each other. Active seafloor spreading is occurring at mid- ocean ridges.
What is a typical rate for seafloor spreading?
It spreads about 6-16 centimeters (3-6 inches) every year. There is not an ocean trench at the East Pacific Rise, because the seafloor spreading is too rapid for one to develop! The newest, thinnest crust on Earth is located near the center of mid-ocean ridge—the actual site of seafloor spreading .
What drives plate tectonic movement?
Three of the forces that have been proposed as the main drivers of tectonic plate movement are: mantle convection currents— warm mantle currents drive and carry plates of lithosphere along a like a conveyor belt; The cooler sinking plate pulls the rest of the warmer plate along behind it.
Where does seafloor spreading occur?
Sea-floor spreading is what happens at the mid- oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.
Who proposed the theory of seafloor spreading?
Harry H. Hess
What does Pangea mean?
Pangea was surrounded by a global ocean called Panthalassa, and it was fully assembled by the Early Permian Epoch (some 299 million to 273 million years ago). Its name is derived from the Greek pangaia, meaning “all the Earth.”
What are the 3 components of lithosphere?
Lithosphere The solid part of the earth. It consists of three main layers: crust, mantle and core .
What small changes does the lithosphere make on a regular basis?
Tectonic plates shift due to convection currents lower down in the mantle, and this can cause the formation of mountains, the eruption of volcanoes, and earthquakes.
Which part of the lithosphere is the thinnest?
The lithosphere is thinnest at mid-ocean ridges, where tectonic plates are tearing apart from each other. 
