G10 Plate Boundaries

Question 1

states that the lithosphere is a strong rigid layer the uppermost mantle and crust that were broken into several major and minor segments called tectonic plates.

Answer 1

Plate Tectonics Theory

Question 2

Major Plates

Answer 2

North America
South America
Pacific
African
Eurasian
Australian-Indian
Antarctic plates.

Question 3

three main types of plate boundaries

Answer 3

divergent
convergent
transform

Question 4

is formed when two plates move away from each other resulting to upward movement of molten material and formation of new seafloor

Answer 4

divergent boundary

Question 5

landform produced by a divergent boundary

Answer 5

ocean floor

Question 6

is formed when two plates move toward each other

Answer 6

convergent boundary

Question 7

convergent boundary is also known

Answer 7

destructive margin

Question 8

is where the oceanic crust is destroyed and recycled.

Answer 8

convergent boundary

Question 9

types of convergent boundaries

Answer 9

oceanic-oceanic

continental-continental

Question 10

When two oceanic crusts converge, the _ oceanic block sinks beneath the other.

Answer 10

denser

Question 11

oceanic-oceanic convergence produces a

Answer 11

volcanic island arc or island arc

Question 12

When two continental plates converge, it produces spectacular mountain ranges, also known as _, such as the Himalayas.

Answer 12

orogens

Question 13

occurs when two plates simply slide past each other

Answer 13

transform fault boundary

Question 14

In this type of boundary, there is no formation or destruction of the new lithosphere.

Answer 14

transform fault boundary

Question 15

a zone in the Earth’s crust where the plates move away from each other

Answer 15

Divergent boundaries

Question 16

also known as the spreading centers.

Answer 16

Divergent boundaries

Question 17

is where the continents split apart and form new continental margins

Answer 17

Divergent boundaries

Question 18

Divergent plate boundaries are considered as _ _ because it’s where the new ocean floor is generated.

Answer 18

constructive margins

Question 19

Elevated areas in the seafloor forms mountain system called the _ _.

Answer 19

mid-ocean ridge

Question 20

These underwater mountains are linked in chains with valleys known as _.

Answer 20

rift

Question 21

is the main mechanism operating along divergent margins.

Answer 21

Seafloor spreading

Question 22

continuous process occurring in mid-oceanic ridges in which both sides of the ridge move apart, causing the spreading.

Answer 22

Seafloor spreading

Question 23

As new seafloor moves away from both sides of the ridge, more melts arise from the asthenosphere. This process is repeated in a _ _- like manner.

Answer 23

conveyer belt

Question 24

Spreading of landmasses into two segments forms

Answer 24

continental rifts

Question 25

areas where tectonic plates move | towards each other

Answer 25

Convergent plate boundaries

Question 26

are often associated with subduction zones, where oceanic crust descends towards the mantle due to differences in density of the subducting plate, the asthenosphere, and the overriding plate

Answer 26

Convergent plate boundaries

Question 27

oceanic crust descends towards the mantle due to differences in _ of the subducting plate, the asthenosphere, and the overriding plate

Answer 27

density

Question 28

oceanic lithosphere is destroyed along trenches and is recycled back into the asthenosphere

Answer 28

Subduction

Question 29

are long, sublinear chains of volcanoes following the orientation of ocean trenches

Answer 29

Arcs

Question 30

the denser oceanic crust subducts under the lighter continental crus

Answer 30

oceanic-continental convergent margins

Question 31

oceanic-continental convergent margins form

Answer 31

volcanic arcs

Question 32

the older and much denser plate subducts under the younger plate

Answer 32

oceanic-oceanic convergent margins

Question 33

oceanic-oceanic convergent margins form

Answer 33

volcanic island arcs

Question 34

Convergent plate boundaries may also develop through the collision of two continental plates, by

Answer 34

continental-continental convergent margin

Question 35

forms mountain ranges with linear elevated regions.

Answer 35

continental-continental convergent margin

Question 36

a continuous process occurring in mid-oceanic ridges in which both sides of the ridge move apart.

Answer 36

seafloor spreading

Question 37

. | Movement in the boundaries induces decompression melting of rocks and form new oceanic lithosphere.

Answer 37

-

Question 38

The primary process operating in oceanic convergent margins is _

Answer 38

subduction

Question 39

are long, sublinear chains of volcanoes following the orientation of ocean trenches.

Answer 39

arcs

Question 40

(Divergent boundaries)occurs within a continent and is caused by opposing tensional forces that stretch and thin the lithosphere, causing the outermost crustal rocks to break through normal faulting, thus forming a continental rift

Answer 40

Continental rifting

Question 41

(Divergent boundaries)may form between two rifted continents once the lithosphere thins sufficiently for magma to erupt along an axis

Answer 41

New ocean basins

Question 42

form different landforms and involve different processes depending on the type of plates involved in the collision

Answer 42

Convergent plate boundaries

Question 43

the denser oceanic crust subducts under the lighter continental crust. This process forms continental volcanic arcs.

Answer 43

oceanic-continental convergent margins

Question 44

the older and much denser plate subducts under the younger plate. This process forms volcanic island arcs.

Answer 44

oceanic-oceanic convergent margins

Question 45

Convergent plate boundaries may also develop through the collision of two continental plates, by

Answer 45

continental-continental convergent margin.

Question 46

forms mountain ranges with linear elevated regions.

Answer 46

continental-continental convergent margin

Question 47

are characterized by horizontal motion along transform fault systems parallel to the boundary separating two plates form fault systems around the world

Answer 47

Transform plate boundaries

Question 48

are part of curvilinear breaks in the seafloor known as _

Answer 48

fracture zones

Question 49

home to landforms including continental rifts and oceanic ridges.

Answer 49

Divergent plate boundaries

Question 50

gives rise to landforms known as continental volcanic arcs

Answer 50

Convergence

Question 51

forms volcanic island arcs, or simply, island arcs.

Answer 51

oceanic-oceanic convergence,

Question 52

involves a buoyant landmass (continents, arcs) moving towards the margin of another buoyant landmass due to the subduction of an intervening seafloor forming orogenic plate.

Answer 52

Continental-continental (C-C) convergence

Question 53

are part of curvilinear breaks in the seafloor known as fracture zones.

Answer 53

Transform faults