1Q: plate tectonics

Question 1

it is a theory that explains the different processes that cause formation of didferent geologic features and phenomena.

Answer 1

plate tectonics theory

Question 2

a german meteorologist and geophysicist, hypothesized and suggested that the landmasses of Earth once merged a supercontinent

Answer 2

Alfred Wegener

Question 3

the two continents after the separation

Answer 3

laurasia and gondwanaland

Question 4

states that the earths lithosphere is composed of fragments or plates that interact with one another.

Answer 4

plate tectonics theory

Question 5

the term tectonic came from the Latin word _____ or Greek word _____ which means to ____’

Answer 5

tectonicus, tektonikos, build

Question 6

the outermost layer of the earth that is composed of the mantle and the crust

Answer 6

lithosphere

Question 7

made of various types of rocks and sediments floating on top of the malleable upper mantle that extend from the surface to about 50km deep. it has a density of 2.6g/cm³

Answer 7

crust

Question 8

thicker and less dense and floats

Answer 8

continental crust

Question 9

denser and thinner

Answer 9

oceanic crust

Question 10

the seven major plates

Answer 10

NA, SA, Eurasian, Indo-Australian, African, Antartic, Pacific

Question 11

intermediate plates

Answer 11

philippine, Caribbean, cocos, nazca, scotia, juan de fuca, and arabian plates

Question 12

the pacific plate moves for approximately ____

Answer 12

8cm or 3 inches

Question 13

the north american llate approximately moves at

Answer 13

3cm ir 1 inch

Question 14

around ___ of earthquakes are felt at plate margins

Answer 14

90%

Question 15

these waves travel in the interior of the earth

Answer 15

primary and secondary waves

Question 16

examples of surface waves

Answer 16

rayleigh waves and long waves

Question 17

what is used to determine the epicenter of an earthquake

Answer 17

the difference in arrival time between the p and s waves

Question 18

if three recorded measurements were done at different stations, _____ will be used to find its epicenter.

Answer 18

triangulation method

Question 19

a scottish marine zoologist that led the challenger expedition in 1872

Answer 19

charles wyville thomson

Question 20

the distribution of volcanoes is mostly found in plate margins which can be either:

Answer 20

constructive or destructive

Question 21

when a plate goes underneath another

Answer 21

subduction

Question 22

a series of volcanoes

Answer 22

volcano arc

Question 23

most of volcano arcs are found here

Answer 23

pacific ring of fire

Question 24

have been formed due to movements of plates, either apart or toward each other

Answer 24

mountains

Question 25

is a **american geologist** that served in the **military** and became the major propronent of **sea floor spreading**

Answer 25

harry h. hess

Question 26

a type of collision between two crustal plates. one plate to subduct from another.

Answer 26

oceanic-oceanic convergence

Question 27

**two continental crustal plates** move toward one another. folding of parts in the continental lithosphere happens.

Answer 27

continental-continental convergence

Question 28

move horizontally to each other

Answer 28

transform

Question 29

another feature that results from movement

Answer 29

rift valley

Question 30

oceanic crust is formed at mid-ocean ridges and spreads outwards

Answer 30

seafloor spreading

Question 31

plate boundaries where the plates move apart from each other

Answer 31

divergent

Question 32

type of collision between an **oceanic** crust and **continental** crust. oceanic crust becomes lighter than continental crust

Answer 32

oceanic continental convergence

Question 33

a deep narrow depression in fhe ocean seafloor caused by the collision and/or subduction of plates

Answer 33

trench

Question 34

brittle solid part of earth; made up of crust and mantle

Answer 34

lithosphere

Question 35

density and thickness of continental crust

Answer 35

2.7g/cm³ and 35-70km

Question 36

primary composition of cc

Answer 36

granite

Question 37

denisty and thickness of the oceanic crust

Answer 37

3.0g/cm³ 7-10km

Question 38

primary composition of oc

Answer 38

basalt

Question 39

a ductile layer under the solid lithospehere

Answer 39

asthenosphere

Question 40

other term for plate boundaries

Answer 40

plate margins

Question 41

the seven continents

Answer 41

• north america • south america • antartica • australia • asia • europe • africa

Question 42

part of the earth's surface directly above the focus of an earthquake

Answer 42

epicenter

Question 43

an apparatus to record vibrations within the earth and the ground

Answer 43

seismograph

Question 44

vent or fissure in the planet's crist in which laba, ash, rock, and gases erupt

Answer 44

volcano

Question 45

measures the energy released at the source of the earthquake

Answer 45

magnitude

Question 46

measures the **strength** of shaking produced by the earthquake at a certain location

Answer 46

intensity

Question 47

plate boundaries that move toward each other

Answer 47

convergent