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BI-100/L > CH2: THE PHYSICAL ENVIRONMENT > Flashcards

CH2: THE PHYSICAL ENVIRONMENT Flashcards

1
Q

innermost layer of the earth
solid inner (iron and nickel)
liquid outer (mostly iron)
super hot (5700K)

A

Core

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2
Q

middle layer of earth
semi-solid layer that helps transport portions of overlying crust

hot liquid inner
solid outer (more viscous and elastic)

rises and expands when heated, descends when cool

A

Mantle

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3
Q

solid outer layer; lithosphere

14 major plates

plates are buoyed by mantle movement and the thickness and density of the plate

A

Crust

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4
Q

the constant motion, moving against, away from, or sliding past of plates

large scale motion plates of the lithosphere

A

Plate Tectonics

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5
Q

denser, thinner, younger crust

A

Oceanic Crust

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6
Q

lighter, thicker, granite, older crust

A

Continental Crust

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7
Q

along mid-ocean ridges where new oceanic crust through volcanic activity

Magma emerges from mantle, fills space, cools as moves away from spreading center

ridges in middle of ocean where magma is below, pushes plates apart

A

Seafloor Spreading

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8
Q

at convergent boundaries where one plate moves under another and sinks into mantle

where oceanic and continental plates meet (oceanic sinks because heavier)

forms a trench

A

Subduction

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9
Q

submarine depression on the sea floor where two plates meet

A

Trench

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10
Q

plates collide

form subduction zones (trenches) or thrust zones (mountains

A

Convergent Boundaries

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11
Q

denser plate sinks (oceanic)

pressure and friction from subduction melt rock which emerges in cracks along the edge of continental crust as volcanoes

A

Oceanic-Continental Converging Boundary

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12
Q

similar density; subduction determined by plate size

pressure from subduction melt rock which emerges as volcanoes in cracks along edge of oceanic crust

A

Oceanic-Oceanic Converging Boundary

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13
Q

plates move apart

form rift zones where new crust is made

A

Divergent Boundaries

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14
Q

plates slide past in opposite directions

A

Transform Boundaries

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15
Q

What 2 things between plates can melt crust and create earthquakes?

A

Friction and Pressure

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16
Q

melted rock heats and expands, working its way through cracks and spaces in the overriding crust in water or through continental crust (volcano)

A

Magma

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17
Q

Where are oceanic islands commonly formed along?

A

Subduction Zones

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18
Q

areas of volcanic activity from superheated mantle plumes that melt through overlying plate, forming volcano/island

stationary even with moving plate

creates ISLAND CHAINS that MIGRATE over time bc of HIGH MAGMATIC ACTIVITY

A

Hotspot Volcanism

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19
Q

When were the Mariana Islands formed?

A

Cenozoic Era

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20
Q

When was Guam formed?

A

Mid Eocene Epoch

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21
Q

deposited in layers from different lava flows and eruption events

A

Volcanic (Igneous) Rock

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22
Q

deposited in layers from different erosion processes with particles of varying sizes and crystal compositions

A

Sedimentary Rock

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23
Q

type of sedimentary rock

growing parts break off and remains of corals and other calcareous animals and plants accumulate as sediments

A

Limestone

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24
Q

What 2 phases of buildup contributed to Guam’s geological history

A

Volcanic and Carbonate

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25
No longer volcanically active Primality submarine volcanism Guam, Rota, Tinian, Saipan, FDM
Volcanic Phase
26
Onset coincided with rifting of the Marianas from the West Mariana Ridge framework and detrital limestone formations islands submerged, coral grows and deposits, then raised volcanic base but north was submerged long enough to form an atoll then raised
Carbonate Phase
27
How was Guam formed?
pacific plate subducted under Philippine plate, causing friction and heat, creating magma to form Guam's volcanic base
28
Guam's oldest volcanic rock in Umatac
Facpi Formation
29
2nd oldest Guam volcanic rock formation
Alutom Formation
30
3rd oldest Guam volcanic rock formation
Umatac Formation
31
2 Northern Major Limestone Types formed by ancient coral reefs and marine deposits
Barrigada Limestone and Mariana Limestone
32
How atolls are formed
coral rubble piles from wave activity and erodes (making atolls dynamic)
33
What is necessary for atoll habitability?
Waves have to replenish carbonate sediment that was reduced by erosion and dissolution
34
sandy, near reef passages, change size but stay in same spot, vulnerable to storms
Type I Islets
35
Largest and most stable, often inhabited, grows bigger over time, affected by typhoons
Type II Islets
36
Long, narrow, curved, grow during storms and erode over time, fresh water under, support bigger life forms
Type III Islets
37
complex, unstable, grow during storms, erode gradually; ex: Cocos Island
Type IV Islets
38
long term patterns of factors (temp, rain, day-length, seasonal changes)
Climate
39
short term changes in atmospheric factors (wind, humidity, rainfall, storms, typhoons; extreme - drought, famine)
Weather
40
What seasons does Guam have?
Wet and Dry
41
What are 2 things that vary between and within islands?
Rainfall and Temp
42
What affects temperature on islands?
Mountains (higher altitudes - colder; air rises to cool and release rain on other side)
43
How do mountains affect rainfall?
windward side gets more rain than sheltered leeward side
44
What factors shape ecosystems?
island's geological makeup (high, low, volcanic, coral) geographic location (rainfall patterns, vulnerability to climate change)
45
side where winds from ocean climb mountain on one side, cooling air and forming clouds for lusher land
Windward Side
46
side where wind falls, dry and sucks moisture out of land making it drier
Leeward Side
47
What defines different biomes?
Climate and Physiognomies (climatic conditions dictate growth forms and can be similar even if not evolutionarily connected)
48
What contribute to seasonal variation?
Temp, sunlight, rainfall, wind, and species reproduction, recruitment, and migration (certain seasons allow for certain fruits to grow or fish to come and turtles to hatch)
49
2 Common perturbations in tropical pacific islands
El Nino & Southern Oscillation Typhoons & Hurricanes
50
Atmospheric pressures change between the Pacific and Indian Oceans, weakening or reversing trade winds (Southern Oscillation), so warm water isn't pushed West and pools in the middle of the Pacific, warming and preventing upwelling in the eastern Pacific Effects: less rain in the western pacific (india, indonesia, aus; droughts, fires, famine) and more rain in the eastern pacific (peru; floods, failed fisheries, typhoons)
El Niño/Southern Oscillation
51
Stronger trade winds push warm ocean water from the Pacific even further west, causing an increase in the upwelling of cold, nutrient rich water in the eastern pacific
La Niña
52
giant whirlwinds with powerful winds and heavy rain that form over warm ocean waters that spin from coriolis effect.
Typhoon/Hurricanes
53
typhoons/hurricanes that spin counterclockwise occur in the ___________ __________
Northern hemisphere
54
typhoons/hurricanes that spin clockwise occur in the ___________ __________
Southern hemisphere
55
tropical cyclone in western pacific
Typhoon
56
tropical cyclone east of international date line; Atlantic ocean
Hurricane
57
tropical cyclone in southern hemisphere and indian ocean
Cyclones
58
tropical cyclone with max winds of 38mph (33 knots) or less
Tropical Depression
59
tropical cyclone with max winds of 39-73 mph (34-63 knots)
Tropical Storm
60
tropical cyclone with max winds of 74mph (64 knots) or higher releases ridiculous amount of energy over miles gains strength from warm water (weakens over land)
Typhoon
61
tropical cyclone with max winds of 111 mph (96 knots) or higher with a 3-5 category on Saffir-Simpson hurricane wind scale
Major Typhoon
62
How often does Guam have tropical storms?
1-2 years
63
How often does Guam have weaker typhones?
4-5 years
64
How often does Guam have super typhoons?
50-60 years

BI-100/L (7 decks)

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