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Contidental Drift
plate tectonics
actions of plate boundries and evidence of plate tectonics
volcanoes
types of volcanoes things
100
What are the 4 types of evidence for contidental drift? and breifly describe them.
Contidental shapes (fit together), matching fossils (where different fossils match on different continents), rock types & structures (where same rocks and structures are found on differnet continents) , and ancient climates (where ice areas are found on tropical areas)
100
What are convection currents?
Where magma that is heated in the center of the earth goes out towards the surface, it cools and goes back to the center and moves the plates
100
what are kinds of Divergent boundries; and explain them
rift- a break in earths crust ridge- only at oceanic oceanic boundry. lava fills the rigde and the ridge goes up higher rift valley- continental and continetal- created by thicker crust
100
VISCOSITY
how well a substance flows
100
sheild volcanoes?
wide formed by liquid lava flows
200
who developed the continental drift hypothesis?
Alfred Wegner
200
What are the three types of plate boundaries? describe and what does it do to the lithosphere?
Divergent; Plates move apart, creates lithosphere. Convergent; Plates move into each other and one slides beneath, destroys lithosphere. Transform Fault; Plates move past each other in opposite directions, doesnt make or destroy lithosphere
200
what are the 2 things you get at convergent boundries?
subduction zones- they destroyed, volcanic arc-melt and magma comes up to the surface
200
what affect do dissloved gases have on volcanoes
they make explosive eruptiuons
200
cinder cones
made of cinder
300
What is a example of matching fossil?
mesosauras
300
What is a rift?
Space between tectonic plates
300
what is paleomagnitism?
when magma cools, the magnetic poles set up. if they arent at north and south, the rock changed positions.
300
WHAT ARE the 2 most important lava flows
Aa and pahoehoe
300
composite cones
most explosive
400
What is pangea?
where all land masses were joined as 1 super continent
400
What is lithosphere driven by
heat in the earth moving the liquid asthenosphere
400
what are hot spots?
when crust moves over a mantle plume the magma rises through the crust.
400
pyroclastic materials
particles produce by eruptions
400
what are plutons
hardened magma fromt he magma chamber
500
Why was the hypothesis rejected by scientist?
He couldn't explain what causes continents to move
500
What is the difference between continental drift and plate techtonics?
They dont have anything to do with each other
500
slab pull-explain
plpate is pulled down into asthenosphere by gravity and sinking magma
500
LIST THE PARTS OF A VOLCANO
magma chamber pipe vent and crater
500
what produces continetal volcanic arcs
oceanic continental