Plate Bundaries

alfred wegener

who made the continental drift theory

plate tectonic theory

A theory which suggests that Earth’s crust is made up of

plates that interact in various ways, thus producing

earthquakes, mountains, volcanoes and other geologic

features

SFRGL

evidences of the continental drift theory?

MAGMA

correction flow by the mantle

mid ocean ridge and magma

seafloor features

age of rock and magnetic stripe

evidence of seafloor features

rocks

everytime it moves, theres a rock that comes out

convection current

is the driving force of

plate tectonics in which hot, plastic-like

material from the mantle rises to the

lithosphere, moves horizontally, cools, and

sinks back to the mantle;provide enough energy

to move the plates in the lithosphere.

divergent boundaries

constructive margins;🡸🡺 plates move apart

convergent boundaries

destructive margins

🡺🡸 plates move together

transform boundaries

conservative margins

🡸

🡺 plates slide past

divergent boundaries

Rock gets THIN in

the middle as it is

pulled apart;Tensional forces

cause the plates to

move apart.

iceland

has a divergent plate

boundary running through its

middle

Mid-Atlantic Ridge

area in the middle of the ocean where a new ocean floor is

formed when lava erupts through the cracks in the Earth’s

crust; is probably

the best-known and

most-studied example

of a divergent-plate

boundary.

Seafloor Spreading

Process by which new ocean floor is formed near the mid

ocean-ridge and moves outward

Subduction Zone

(one of the slabs of the

lithosphere to subduct beneath an overriding

plate); where ocean plates slide under another plate

Orogenic belt

(two plates collide and compress)

Subduction

The process in which the crust plunges back into the Earth

Trench

A depression in the seafloor produced by subduction process

Continental Volcanic Arc

Mountains are formed in part by igneous activity associated

with subduction of oceanic lithosphere beneath a continent.

Volcanic Island arc

A chain of volcanoes that develop parallel to a trench

Transform Boundaries

Occurs when two plates move parallel to one

another in opposite direction

no tearing or crushing

no

damage occurs to the

lithosphere

Faults

San Andreas Fault

Cause most earthquake

damage

Shearing forces

cause

the plates to move past

one another.

hotspots

Regions of earthquake and volcanic activity which do not occur along

plate boundaries

Hotspot Volcanoes

Hot mantle plumes breaching the surface in the middle of

a tectonic plate

hawaiin islanf

examples

of hotspot volcanoes.

Volcanism

is

mostly

focused at

plate margins

igneous

Magma/lava solidifies into what intrusive/extrusive rock

metamorphic rock

Heat from the magma can change the rock around it. Rock that

recrystallizes without melting becomes …?