Geography, asked by benjaminitogo, 10 months ago

Define plate tectonic and mention landforms with their events associated in each plate boundary

Answers

Answered by nishantsaxena53
2

#BAL

the study of the structure of the earth's crust and mantle with reference to the theory that the earth's lithosphere is divided into large rigid blocks ( plates) that are floating on semifluid rock and are thus able to interact with each other at their boundaries, and to the associated theories of continental drift and seafloor spreading.

Landform: DEEP-OCEAN TRENCH

Plate Boundary: CONVERGENT

Type of Plates:

Oceanic Plate (OP) vs Continental (CP) or Oceanic Plate

How is it formed?

As the MORE DENSE oceanic plate (OP) subducts under

the less dense plate (CP or OP), it pulls the front edge

of the less dense plate down, creating a deep ‘zone’

(TRENCH).

Landform: VOLCANOES

Plate Boundary: CONVERGENT

Type of Plates:

Oceanic Plate (OP) vs. Continental Plate (CP)

How is it formed?

The MORE DENSE oceanic plate (OP) subducts under

the less dense continental plate (CP) and is driven

down in to the HOT asthenosphere/mantle. Subducted

plate MELTS due to extreme heat and friction. Melted

plate rises up through the crust, where it reaches the

surface and cools. Happens repeatedly to create large

volcanoes.

Landform: VOLCANIC ISLAND ARC

Plate Boundary: CONVERGENT

Type of Plates:

Oceanic Plate (OP) vs. Oceanic Plate (OP)

How is it formed?

The same process that forms volcanoes on land.

Subducted OP melts and rises to reach the surface of

the OP. This happens repeatedly, building and building

until the volcano breaks the surface of the water,

creating a chain of islands along the subduction zone.

Landform: Folded MOUNTAINS

Plate Boundary: CONVERGENT

Type of Plates:

Continental Plate (CP) vs. Continental Plate (CP)

How are they formed?

Two continental plates collide. Continental plate is not

dense enough to subduct. As a result, the continental

crust folds upward (nowhere else to go) creating a

chain of folded mountains.

Landform: RIFT VALLEY

Plate Boundary: DIVERGENT

Type of Plates: 2 Continental Plates (CP) pull apart

How is it formed?

Two continental plates (CP) move away from each

other, stretching out the crust, until it begins to

break/fault. As crust is stretched wider, the valley

drops deeper. Eventually can lead to the creation of a

new body of water if low enough.

Landform: MID-OCEAN RIDGE

Plate Boundary: DIVERGENT

Type of Plates: 2 Oceanic Plates (OP) pull apart

How is it formed?

Two oceanic plates (OP) move away from each other,

allowing magma to rise up from inside the Earth. The

magma reaches the bottom of the ocean, turns in to

lava and cools (forming new rock). This cycle continues

constantly spreading the sea floor and adding new

material along this chain of mountains.

Sea Floor spreading occurs at these mid-ocean ridges

EVENT: STRESS

LOCATION:

Near Plate Boundaries (past and present)

How is it generated?

Moving plates create ‘stress’ in the crust,

which is a force that acts on rock that

change it’s shape/volume (deformation)

by squeezing it together, stretching it out,

or twisting the rock .

Landform/Event: FAULTS

LOCATION:

Near Plate Boundaries (past and present)

How they are created?

The Stress (energy) that results from

plate movement builds up in rock, until

the rock finally breaks. Movement occurs

along this ‘break’.

EVENT: EARTHQUAKES

LOCATION:

CONVERGENT, DIVERGENT, TRANSFORM Boundaries

As well as smaller ‘FAULTS’

How are they generated?

Movement between plates/rock is not smooth. Plates

get ‘stuck’ in regions while these plates CONTINUE to

move. Rock(s) eventually cannot handle the built up

energy and break (move), releasing that energy

outward in all directions (seismic waves).

Answered by nasirkhan38470
1

Answer:

The location where two plates meet is called a plate boundary. Plate boundaries are commonly associated with geological events such as earthquakes and the creation of topographic features such as mountains, volcanoes, mid-ocean ridges, and oceanic trenches

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