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Lesson 11 Flashcards

1
Q

What forms in the brittle ice of glaciers?

A

crevasses

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2
Q

Shallow wetland that typically form after rainfall?

A

Playa lakes

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3
Q

What are two things about plate tectonics that could have caused glaciation?

A
  1. Continents arranged differently

2. Changes in oceanic circulation

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4
Q

What important mechanism of glacial movement consists of the whole ice mass moving along the ground?

A

Slipping along the ground

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5
Q

Ridge line come together to form a point ?

A

Horn

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6
Q

What glacial drift is relatively well-sorted sediment laid down by glacial meltwater?

A

stratified drift

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7
Q

How do Glacier form?

A

compaction and recrystallization of snow

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8
Q

What is associated with variations in earths orbit

A

Changes in climate over the past several hundred thousand years

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9
Q

What is the axis wobbling called?

A

Precession

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10
Q

What is the angle of earths axis called?

A

Obliquity

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11
Q

What do glaciers show about the flow?

A

shows the past and present flow

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12
Q

What does milankovitch’s theory say about earths orbit ?

A

The shape of earths orbit varies

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13
Q

A u shaped valley with steep, straight sides and a flat or rounded bottom.

A

Glacial trough

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14
Q

a valley which is cut across by a deeper valley or a cliff.

Stream drops straight down.

A

Hanging valley

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15
Q

What cycles are Glaciers a part of?

A

hydrologic cycle

rock cycle

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16
Q

Moraine formed between two valley glaciers that have joined?

A

medial moraine

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17
Q

How much of earths land are was covered during the ice age ?

A

30%

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18
Q

What is it called when below about 50 meters, pressure is great, causing ice to flow like a plastic material.

A

Plastic flow

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19
Q

What is the balance or lack of balance between accumulation at the upper end of the glacier, and loss at the lower end called?

A

glacial budget

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20
Q

Alluvial fans, playas, and playa lakes are features often associated with these landscapes.

A

Alluvial fans
Playas
Playa lakes

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21
Q

Glacier erosion by lifting pieces of bedrock out of place?

A

plucking

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22
Q

What zone is the area where a glacier forms with snow accumulation and ice formation?

A

Zone of accumulation

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23
Q

How many basic cycles in the Earth system are Glaciers a part of?

A

two

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24
Q

Many of the landscapes of the Basin and Range region of the ______ and ______ United States are the result of streams eroding uplifted mountain blocks and depositing the sediment in interior basins.

A

western and southern

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25
Where is the zone of fracture located?
Uppermost 50 meters
26
What glacial drift is unsorted sediment deposited directly by the ice?
till
27
What type of abrasion erosion causes pulverized rock?
Rock flour
28
a long, narrow, deep inlet of the sea between high cliffs?
Fiord
29
What are the two movements of glacial ice?
Plastic flow | Slipping along the ground
30
What is the effect of ice age glaciers? (Water)
Changes in sea level
31
Where is wind erosion more significant?
dry areas
32
What are the two distinct types of glacial drift?
till | stratified drift
33
What is the shape of earths orbit called?
Eccentricity
34
What are the two ways glaciers erode land?
plucking | abrasion
35
What does milankovitch’s theory say about the earths axis?
the angle changes The axis wobbles
36
What type of glacier exists on a much larger scale, covering most of Greenland and Antarctica?
Ice sheets
37
What is responsible for most of the erosional work in a desert?
Running water
38
other glacial depositions
study pics may has
39
a half-open steep-sided hollow at the head of a valley or on a mountainside
Cirque
40
Where is ice brittle in a glacier?
Zone of fracture
41
What is the effect of ice age glaciers? (Living things)
Plants and animals migrate
42
What two things must a theory of glaciation causes include?
Cooling of earth | Short term climate changes
43
What is any sediment of glacial origin called? .
drift
44
What is a thick mass of ice that forms over land?
glacier
45
What is the most widespread features created by glacial deposition?
Moraines
46
Ridge line between 2 valleys
Arte
47
What type of abrasion erosion causes grooves in the bedrock?
Striations
48
Moraine which mark the former position of the front of a glacier?
end moraine
49
What is the division of geological time called?
Pleistocene epoch
50
What are the 2 types of main glaciers and 2 other ones?
Valley or Alpine Ice sheets or Continental Ice caps Piedmont
51
What is the main role of wind in a desert?
transportation and deposition of sediment
52
Glacier erosion by grinding and scraping of a rock surface?
abrasion
53
Moraines associated with valley glaciers and ice sheets?
end moraine | ground moraine
54
A fan-shaped mass of alluvium deposited as the flow of a river decreases in velocity?
Alluvial fans
55
Between the two glacial drifts, which is well sorted sediment and which is unsorted sediment?
well sorted: stratified drift | unsorted: till
56
A dry, vegetation-free, flat area at the lowest part of an undrained desert basin?
Playas
57
Moraine formed along the sides of the valley?
lateral moraine
58
What is the effect of ice age glaciers? (Weather)
Climatic changes
59
What are boulders embedded in till?
Glacial erratics
60
What is the effect of ice age glaciers? (Earths layers)
Rebounding upward of the crust?
61
Practically all desert streams are dry most of the time and are said to be _____.
ephemeral
62
Moraines only associated with valley glaciers?
lateral moraines | medial moraines
63
When did the ice age begin?
2-3 million years ago
64
Layers or ridges of till created by glacial deposition?
Moraines
65
What are the two types of abrasion erosion from a glacier?
Rock flour | Striations
66
Name two of the proposed causes of glaciation?
Plate Tectonics Variations in earths orbit
67
What zone is the area where there is a net loss due to melting?
Zone of wastage
68
What type of glacier is found in mountain areas ?
valley or alpine glaciers
69
Moraine with an undulating layer of till deposited as the ice front retreats?
ground moraine
70
What type of glacier usually follows valleys that were originally occupied by streams?
valley or alpine glaciers

College Geology (14 decks)

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