earthquakes test

Question 1

p waves

Answer 1

1-primary wave
2-faster
3-travels through solid, liquid,gas
4-compressional wave

Question 2

s waves

Answer 2

1- secondary wave
2- slower
3- travels through solids only
4- sheer wave

Question 3

eq origin time

Answer 3

when an eq occures

Question 4

crust

Answer 4

solid

Question 5

mantle

Answer 5

solid

Question 6

outer core

Answer 6

liquid (magma)
s waves cant go through it

Question 7

how do we know about earths other layers?

Answer 7

refraction of EQ seosmic waves in different densities (layers)

Question 8

continental crust

Answer 8

1- thicker
2- less dense
3-felsic
4-granite

Question 9

oceanic crust

Answer 9

1- thinner
2- more dense
3- mafic
4- basaltic

Question 10

plate tectonics

Answer 10

earths crust is made of plates that fit together like puzzle pieces.

Question 11

plate boundaries

Answer 11

where the action is

Question 12

converegent boundaries features

Answer 12

1- earthquakes
2- tall , mountains

Question 13

transform boundaries features

Answer 13

1- earthquakes

Question 14

divergent plate boundary features

Answer 14

1-mild eqs
2- mil volcanos
3- new seafloor is formed
4-mountain chain

Question 15

The hawaiin islands

Answer 15

form as the pacific plate moves over a stationary hotspot

Question 16

evidence of pangea

Answer 16

The super”continent¨ that existed abt 200 maya when all the continents were connected
1- puzzle pieces, shapes of the continents
2- identical fossils on different continents
3- rock formation on different continents

Question 17

paleomagnetism

Answer 17

earths magnetic field has flipped many times in earths history.

Question 18

the shadow zone

Answer 18

seismic station records no p or s waves

Question 19

at 1 hr 20 min and 40 sec the distance from the station to the epicenter is 3,000 kilometers. the eqs origin time was

Answer 19

1 hr 16 min 00 sec

Question 20

a seismograph station 3x10^3 kilometers from an epicenter recieves p waves at 3;33;00 in the afternoon. what was the origin time of the eq

Answer 20

3;27;20

Question 21

4,00 kilometers from the station. the p wave arrived at 3:32;30. when did the eq occur

Answer 21

5;18 pm

Question 22

an eq occured at 5;00;00 am. at what time would the p wave reach a seismic station at 3,000 kilometers from the epicenter

Answer 22

5:05:40 am

Question 23

the thinnest section of earths crust is found beneath

Answer 23

oceans

Question 24

why is earths outer core inferred to be a liquid

Answer 24

s waves cannot pass through the outer core

Question 25

earths outer core is best inferred to be

Answer 25

liquid, with an average density of approixmently 11 g/cm^3

Question 26

compared to the oceanic crust the continental crust is usually

Answer 26

thicker with a less dense granitic composition

Question 27

compared to earths continental crust, earths oceanic crust is

Answer 27

thinner and more dense

Question 28

compared to earths oceanic crust, earths continental crustt is

Answer 28

thicker and composed of granite

Question 29

the interior of earth between a depth of 5200 and 6300 kilometers is inferred to be composed mostly of

Answer 29

iron and nickle

Question 30

the basaltic bedrock of the oceanic crust is classified as

Answer 30

magic, with a density of 3.0 g/cm3

Question 31

compared to the continental crust the oceanic crust is

Answer 31

more dense and more mafic

Question 32

compared to continental crust oceanic crust is

Answer 32

more dense, more mafic and thinner

Question 33

the pressure at the interface between earths outer core and inner core is inferred to be

Answer 33

3.1 million atmospheres

Question 34

what are the inferred pressure temperature at the boundary of earths stiffer mantle and outer core

Answer 34

1.5 million atmospheres pressure and an interior temperature of 4950 degrees celcius

Question 35

compared to earths crust earths core is believes to be

Answer 35

more dense, hotter and composed of more iron

Question 36

at a depth of 2,000 kilometers the temperature of the stiffer mantle is inferred to be

Answer 36

4,200

Question 37

as depth within earths interior increases the

Answer 37

density, pressure and temp increases

Question 38

the inferred temp at the interface between the stiffer mantle and the athenosphere is closest to

Answer 38

2500