GLG 121 tectonic plates

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older crust moves _______________ to either side of the spreading axis to create space for the new crust. this is a process called _________ __________

symmetrically; seafloor spreading

what is the name of the rock that was formerly lava until it cooled and solidified

basalt

what rock makes up earths oceanic crust

basalt

lithosphere creation happens beneath what kind of boundary

divergent

what happens to the asthenospheric mantle under the new crust

it cools and is added to the lithospheric plate

what happens to the asthenospheric mantle beneath divergent plate boundary

it rises and starts to melt which occurs when the rising mantle experiences lower and lower pressure

explain two phase flow

it's when the asthenospheric mantle is partially liquid and solid. the liquid separates from the solid and flows up while the solid mantle flows sideways

tectonic plates are aka

lithosphere

the _________ sinks under the ___________ at a convergent plate boundary in a ___________ ____________

lithosphere;asthenosphere;subduction zone

the outer layer of crust and the layer in the uppermost mantle together form a...

mobile slab of lithosphere

where are the pan sites of plate tectonic activities

plate boundaries

what type of boundary happens when two plates slide past each other

transform faults

what do convergent plate boundaries mark

where one of the two converging plates sinks beneath the other in a subduction zone

what does an oceanic trench mark

where the downgoing plate in a convergent boundary bends down

what are the three types of plate boundaries

1: divergent 2: convergent 3: transform faults

tectonic plates move over what

asthenosphere

what is the term for the underlying layer in the uppermost mantle

asthenosphere

which layer is deeper, warmer, and weaker than the other? a) asthenosphere b) lithosphere

asthenosphere is weaker

what is a tectonic plate composed of

both the outer layer of crust and another layer in the uppermost mantle

what kind of boundaries are deeply submerged

convergent

what is it called when melting happens by lowering pressure

decompression melting

what kind of melting occurs at convergent plate boundaries

flux

partial melting induced by fluid is known as.....

flux melting

how does lithosphere creation happen

new material for new plates is produced under a divergent boundary

divergent plate boundaries are aka

oceanic spreading centers

where is new plate material continuously created

oceanic spreading centers

what two things from the lithosphere cause the asthenosphere to start melting at a convergent plate boundary

released water and sediment

what is the texture of tectonic plates

rigid

a __________ zone at a convergent boundary causes earthquakes

seismo

where did the force of plate tectonics originate?

the origin is the sinking of dense lithosphere in subduction zones

how is the magma produced at convergent boundaries different from that produced at divergent boundaries

they have more water


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