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The [Milankovitch Theory] explains [cyclical] variations in Earth's [climate] as a result of variations in Earth's rotation and orbit.
The [-----] explains [-----] variations in Earth's [-----] as a result of variations in Earth's rotation and orbit.
Accumulation exceeds wastage
Which one of the following applies to a valley glacier that lengthens (extends its terminus downslope) over a period of many years?
A _____ cross-valley profile is typical of canyons and valleys eroded and deepended by alpine or valley glaciers.
Till is an unsorted sediment deposited directly from the melting glacial ice; stream action is not involved.
Smooth, tapering ridge of till; formed and shaped beneath a continental ice sheet
A drumlin is a ____________.
.----- basin in high, mountainous terrain can often be associated with a body of water called a 2.----- lake.
Depressions from a retreating glacier that leaves a large block of ice that subsequently melts.
Confined to mountain valleys
Flow from high to low elevations
-Can be several kilometers across, 200 km long, and hundreds of meters thick
Balance between expansion and contraction of glacier in response to accumulation and wastage
Separates zone of accumulation from zone of ablation
▪If moves up the glacier, the glacier is receding
▪If moves down the glacier, the glacier is advancing
Bedrock eroded through abrasion:
Tributary valley whose floor is above the main valley
-Often have spectacular waterfalls
the process whereby rock is worn smooth by the impact of sediment transported by the movement of sediment-laden ice over bedrock
a smooth, glistening rock surface formed by the movement of sediment-laden ice over bedrock
Moraine carried on central surface of glacier
-Formed when two lateral moraines merge
Depressions from a retreating glacier that leaves a large block of ice that subsequently melts
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