unit 2 test

Question 1

whats happening to the distance between south america and africa

Answer 1

slowly drifting (2-3 cm per year)

Question 2

in what way is mt everest changing

Answer 2

getting taller

Question 3

what observation did early mapmakers make when looking at the continents that made them wonder if they were connected

Answer 3

south america and Africa seemed to fit suggesting they were connected

Question 4

scientist that proposed continental drift

Answer 4

Alfred wegener

Question 5

what does pangaea mean

Answer 5

all earth

Question 6

how long ago did he think pangea began to break up

Answer 6

200 million years ago

Question 7

what was his hypothesis called

Answer 7

continental drift

Question 8

3 features on adjacent continents that match

Answer 8

fossil evidence
geological similarities
fits together like a puzzle

Question 9

why was wegeners theory rejected at first

Answer 9

no evidense

Question 10

what did people think the bottom of the ocean look like

Answer 10

flat

Question 11

2 types of ocean features scientists found using sonar

Answer 11

mid Atlantic ridge
trenches

Question 12

how does the Mariana trench compare in size of the grand canyon

Answer 12

trench 36000 canyon 6000
trench is 30000 deeper

Question 13

what did scientists notice about the age of the rocks nearest the Mid Atlantic ridge compared with the age of the rocks farthest from the ridge

Answer 13

ones near the ridge are younger than the ones farther from the ridge are older and thicker

Question 14

what did wegener notice about the depth of the sediment on either side of the ridge

Answer 14

increased with distance from the ridge

Question 15

what fills gap and creates new rock when plates seperate at the mid atlantic ridge

Answer 15

magma

Question 16

how do we know the the earths magnetic field has reversed in the past

Answer 16

studying patterns of minerals in the rock

Question 17

what causes earths magnetic field?

Answer 17

movement of molten iron and nickel

Question 18

what happens that makes the field reverse from time to time

Answer 18

change in flow in the iron

Question 19

how many major plates are there

Answer 19

7

Question 20

which plate in the us on

Answer 20

north american

Question 21

what the the pacific ring of fire

Answer 21

horseshoe shaped area in the pacific ocean of volcanoes and earthuakes

Question 22

divergent boundary

Answer 22

plates move apart
mid atlantic ridge

Question 23

convergent boundary

Answer 23

plates collide
Himalayans

Question 24

transform boundary

Answer 24

plates slide past each other
san andreas fault

Question 25

cont/cont

Answer 25

make mountains: collide into weird mountain shapes

Question 26

cont/oceanic

Answer 26

trench more dense goes under less dense

Question 27

oceanic/oceanic

Answer 27

trench

Question 28

what a hot spot? which islands are located over a hotspot

Answer 28

fixed area of volcanoes
hawaiian islands created ny the hotspot

Question 29

layers of earth and their meterial

Answer 29

crust- solid rock
mantle- semi solid rock
outer core- semi solid iron and nickel
inner core- solid iron and nickel

Question 30

where is asthenoshpere locateed

Answer 30

upper mantle

Question 31

what causes plates to move along the surfa e of the earth

Answer 31

currents in the asthenoshpere