H3 Flashcards

1
Q

age of east african valley

A

5,3 mil yrs old

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2
Q

age of red sea

A

25-30 mil yrs old

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3
Q

age of atlantic ocean

A

50 mil yrs old

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4
Q

age of stille oceaan (pacific)

A

55 mil yrs old

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5
Q

age of the mediterranean sea

A

180 mil yrs old

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6
Q

age of the himalayas

A

225 mil yrs old

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7
Q

alfred wegener

A

german meteorologist who developed the hypothesis of Continental Drift (verschuiving) in 1915.

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8
Q

Continental Drift hypothesis

A

“once (>200 million years ago), there was one large landmass (pangea) that slowly fragmented into our current landmassa’s”

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9
Q

how did pangea drift apart?

A
  1. the granite continental crust “plowed” through the basalt ocean substrate according to Wegener
  2. new basalt flowed into the opening and formed the atlantic ocean
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10
Q

is wegener’s hypothesis on how pangea fell apart possible?

A

he supported his hypothesis with facts, but indirect proof is difficult to measure. There is still no explanation for driving force yet. Despite Wegener’s evidence, it took until about 1950 before the theory was accepted and extended

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11
Q

the moving ocean floor: mid-ocean ridges

A

here you can find seafloor spreading

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12
Q

seafloor spreading

A

plates in the lithosphere move away from each other and between the plates, new lithosphere is formed.

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13
Q

what do the structures of mid-ocean ridges show?

A
  1. there is tension
  2. along the axis there are fractures (breuken –> normal faults)
  3. laterally there are disturbances (verstoringen –> transform faults)
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14
Q

normal fault

A

a normal fault, also called shear (afschuiving), is vertical and is caused by stress in the opposite direction. This happens with divergent motion.

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15
Q

reverse fault

A

a reverse fault, also called a shift (opschuiving), is vertical and is caused by compression. This happens with convergent motion.

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16
Q

strike-slip fault

A

Strike-slip fault, also called transcurrent fault (horizontaal- verschuiving), wrench fault, or lateral fault, in geology, a fracture in the rocks of Earth’s crust in which the rock masses slip past one another parallel to the strike, the intersection of a rock surface with the surface or another horizontal plane.

17
Q

subduction zones

A

where destruction of sea floor occurs.

18
Q

subduction

A

Subduction is a geological process in which the oceanic lithosphere is recycled into the Earth’s mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle

19
Q

how is the pacific ocean changing in size

A

decreases in size

20
Q

how is the atlantic ocean changing in size

A

increasing in size

21
Q

proof of sea-floor spreading?

A
  1. sediment
  2. age
  3. magnetism
22
Q

magnetic bands

A

at mid-ocean ridges, magnetic anomalies (afwijkingen) were observed. As a result of measuring them, a pattern became visible in which alternating strong and weak magnetic bands were observed parallel to the ridge

23
Q

geomagnetism

A

the Earth’s magnetic field produced by the flow of iron-rich material in the core.

24
Q

paleomagnetism

A

fissile magnetism in rocks. When the direction of the minerals corresponds to the current geomagnetism, we measure a stronger magnetic field and vice versa

25
Q

what does the ocean floor primarily consist of?

A

basalt with minerals rich in iron. these minerals aligned with the Earth’s magnetic field to form volcanic basalts as lava sprang up and crystallised.

26
Q

what are the direction of the minerals called?

A
  1. normal polarity

2. reverse polarity

27
Q

where are the alternating magnetic fields observable?

A

by mid-ocean ridges

28
Q

rate of seafloor spreading equation

A

A = distance of a from the crest

A/time of polarity change at A

29
Q

Material from the mantle to the surface location

A

It is not only in mid-ocean ridges that material comes from the mantle to the surface. Think of volcanoes (both above and underwater). also gives an indication as to the speed of the lithospheric plate

30
Q

island chains

A

can arise from the movement of a plate over a stationary mantle plume.

31
Q

does a mantel plume move or is it always stationary?

A

both

32
Q

wilson cycle

A

shows the steps in the development of an ocean basin

33
Q

Plate tectonic

A
  1. continental drift theory expanded upon. Proof for plate tectonics is:
    a. seafloor spreading (driven by the hot core of the earth)
    b. geomagnetism
34
Q

embryonic stage of wilson cycle (motion, physiography, example)

A

embryonaal stadium

motion = uplift

physiography = complex system of linear rift valleys on continent

example = east african rift valleys

35
Q

juvenile stage of wilson cycle (motion, physiography, example)

A

juveniel stadium

motion = divergence (spreading)

physiography = narrow seas with matching coasts

example = red sea

36
Q

mature stage of wilson cycle (motion, physiography, example)

A

volwassen stadium

motion = divergence (spreading)

physiography = ocean basin with continental margins

example = atlantic, indian, arctic oceans

37
Q

declining stage of wilson cycle (motion, physiography, example)

A

afnemend stadium

motion = convergence (subduction)

physiography = island arcs and trenches around basin edge

example = pacific ocean

38
Q

terminal stage of wilson cycle (motion, physiography, example)

A

eindstadium

motion = convergence (collision and uplift)

physiography = narrow, irregular seas with young mts

example = mediterranean sea

39
Q

suturing stage of wilson cycle (motion, physiography, example)

A

opvullend

motion = convergence and uplift

physiography = young to mature mountain belts

example = himalayas