Chapter 22 Glaciers – Flashcards
30 test answers
Unlock all answers in this set
Unlock answers 30question
Mars has polar ice caps that differ from the Earth's Antarctic ice cap in that ____________. a. the Martian caps consist of a combination of water ice and frozen carbon dioxide (dry ice) b. the Martian caps have a spiral fracture pattern not found in Antarctica c. Martian caps are ablated by sublimation only; there is currently no liquid water on Mars d. All of the above are correct
answer
d. All of the above are correct
Unlock the answer
question
A lake that forms within a bowl-shaped depression formed by a mountain glacier is termed a (an) ____________. a. arête b. cirque c. horn d. tarn
answer
d. tarn
Unlock the answer
question
Valleys carved by glaciers tend to be shaped like the letter ____________, whereas valleys carved by water tend to shaped like the letter ____________. a. V; U b. V; C c. U; V d. V; I
answer
c. U; V
Unlock the answer
question
A remnant ridge separating two bowl-shaped depressions formed by a mountain glacier is termed a (an) ____________. a. arête b. cirque c. horn d. tarn
answer
a. arête
Unlock the answer
question
Question text The current interglacial interval began a little more than ____________ years ago. a. 1,000 b. 10,000 c. 100,000 d. 1 million
answer
b. 10,000
Unlock the answer
question
Given the modern continental configuration, it is much easier for large continental ice sheets to become established in the ____________ Hemisphere than in the ____________ Hemisphere. a. eastern; western b. western; eastern c. northern; southern d. southern; northern
answer
c. northern; southern
Unlock the answer
question
Walking across an Antarctic ice sheet during winter would not be very treacherous, because ice is not slippery at temperatures well below freezing. a. true b. false
answer
b. false
Unlock the answer
question
Although glaciers advanced no farther south than the midwestern states during the Pleistocene, periglacial loess was blown deep into the southeastern states. Select one: a. true b. false
answer
a. true
Unlock the answer
question
Stratified sorted sand and gravel are deposited by ____________. a. mountain glaciers b. continental glaciers c. glacial outwash streams d. wind
answer
c. glacial outwash streams
Unlock the answer
question
Areas on the southern margins of the continental glaciers of the northern hemisphere were much ____________ during Plio-Pleistocene glaciations than they are today, as suggested by evidence of large ____________ during this time. a. warmer; tropical rainforests b. wetter; tropical rainforests c. drier; deserts d. wetter; pluvial lakes
answer
d. wetter; pluvial lakes
Unlock the answer
question
An intermediate product in the transformation of snow to glacial ice is ____________. Select one: a. firn b. sublimation c. ablation d. terminus
answer
a. firn
Unlock the answer
question
Sediments deposited directly by glaciers as they melt are termed ____________. a. firn b. loess c. outwash d. till
answer
d. till
Unlock the answer
question
Because glacial advance is driven by gravity, it is impossible for glaciers to advance over perfectly flat terrain. a. true b. false
answer
b. false
Unlock the answer
question
By increasing the albedo of Earth, global ice sheets produce conditions that are ____________ to their further advance, thus providing an example of ____________ feedback. a. detrimental; positive b. detrimental; negative c. favorable; positive d. favorable; negative
answer
c. favorable; positive
Unlock the answer
question
The first scientist to theorize the past presence of glaciers in Europe was ____________. a. Isaac Newton b. Charles Darwin c. Walter Alvarez d. Louis Agassiz
answer
d. Louis Agassiz
Unlock the answer
question
An angular peak surrounded by three or more bowl-shaped depressions formed by a mountain glacier is termed a (an) ____________. a. arête b. cirque c. horn d. tarn
answer
c. horn
Unlock the answer
question
Today, continental glaciers are limited to Antarctica and ____________. a. Alaska b. Greenland c. Canada d. Siberia
answer
b. Greenland
Unlock the answer
question
The effect of periodic changes in Earth's orbital eccentricity and magnitude and direction (precession) of Earth's axial tilt on the advance and retreat of ice sheets was first proposed by ____________. a. Richter b. Milankovitch c. Mohorivic d. Lyell
answer
b. Milankovitch
Unlock the answer
question
When sea level rises, causing the ocean to fill a glacially carved valley, a ____________ results. a. smorgasbord b. tarn c. fjord d. ford
answer
c. fjord
Unlock the answer
question
Sediments deposited directly by glaciers as they melt are characterized by ____________. a. uniformly coarse grain size b. uniformly fine grain size c. an absence of sorting d. graded bedding
answer
c. an absence of sorting
Unlock the answer
question
At the present, glaciers cover about ____________ of the surface of the continents. a. 1% b. 5% c. 10% d. 20%
answer
c. 10%
Unlock the answer
question
Cirques and horns are features associated with ____________. a. mountain glaciation b. continental glaciation c. glacial outwash deposits d. loess deposits
answer
a. mountain glaciation
Unlock the answer
question
A bowl-shaped depression formed by a mountain glacier is termed a (an) ____________. a. arête b. cirque c. horn d. tarn
answer
b. cirque
Unlock the answer
question
An important long-term factor determining whether glacial ice will form on the continents has likely been the proportion of which gas in the atmosphere? a. oxygen b. nitrogen c. carbon dioxide d. carbon monoxide
answer
c. carbon dioxide
Unlock the answer
question
Glacial ice exhibits ____________ behavior near the top, but ____________ behavior beneath a depth of 60 m. a. brittle; ductile b. ductile; brittle c. solid; liquid d. plastic; elastic
answer
a. brittle; ductile
Unlock the answer
question
Wind blows finer particles long distances from glacial environments, where they settle out to form ____________. a. firn b. loess c. outwash d. til
answer
b. loess
Unlock the answer
