river landscapes Flashcards
(41 cards)
what does a typical river drainage basin consist of
watershed,tributaries, the mouth, the source, confluence,channel
whats erosion
the wearing away of the land by a river
whats deposition
the depositing (dumping) of material carried by the river
hydraulic action
the sheer force of the water hitting the banks and river bed
abrasion
the bed and banks are worn doen by the rivers load . the river throws particles against the bed and banks
attrition
material (the load) carried by the river bump into eachother and so are smoothed and broken down into smaller particles
corrosion
chemical action of river water. the acids in the water slowly dissolve the bed and banks if the river particullarly limestone
constructive plate margin
2 plates moving away from eachother
destructive plate margine?
2 plates move towards eachother
conservative margin
to plates move sideways past eachother at either opposite directions, or the same direction at different speeds
which is denser oceanic or continental
oceanic plates are denser than continental plates
example of destructive margins
The atacama trench along the West Coast of South America, the oceanic Nazca plate is being subducted beneath the continental South American plate.
example of constructive margin
The movement of the Eurasian plate and the North American plate away from one another is forming the mid Atlantic Ridge
Example of a conservative margin
at the San Andreas fault the Pacific plate is moving in the same direction as the North American plate but faster
How does a volcano occur at a destructive margin
The denser oceanic plate moves down into the mantle where it melts. A pool of magma forms, which then rises through cracks in the crust called vents. The magma erupts forming a volcano
How does a volcano occur at constructive plate margins
The magma rises up into the gap created by the plates moving apart forming volcano
What are earthquakes caused by
The tension that builds up at all three types of plate margin
how does tension buildup at destructive margins
one plate gets stuck as it moves past together
How does tension buildup at constructive margins
Along cracks in the plates as they move away from each other
How does tension buildup at conservative margin
Plates that are grinding past each other gets stuck
When was New Zealand’s earthquake
2016
what was the magnitude of New Zealand’s earthquake
7.8
What is the GDP per capita of New zealand
US $ 40,331
How many people died in the New Zealand earthquake
Two people died and 50 people were injured
