37 Multiple choice questions
- Sediment transported by flowing ice and deposited beneath a glacier or at its toe.
of fine-grained sediments deposited from the wind; large deposits of
loess formed from fine-grained glacial sediment blown off outwash
- A large block of ice that calves off the front of a glacier and drops into the sea.
- The boundary between the zone of accumulation and the zone of ablation on a glacier.
- A strip of debris along the side margins of a glacier.
- The forward movement of a glacier's toe when the supply of snow exceeds the rate of ablation.
ridge of sorted sand and gravel that snakes across a ground moraine;
the sediment of an esker was deposited in subglacial meltwater tunnels.
- A glacier that exists in regions where it is warm enough for liquid water to occur in films between the grains of ice.
strip of sediment in the interior of a glacier, parallel to the flow
direction of the glacier, formed by the lateral moraines of two merging
- The end moraine at the farthest limit of glaciation.
- A residual knife-edge ridge of rock that separates two adjacent cirques.
deformational process in which mineral grains behave like plastic and,
when compressed or sheared, become flattened or elongate without
cracking or breaking.
movement of a glacier's toe back toward the glacier's origin; glacial
retreat occurs if the rate of ablation exceeds the rate of supply.
- A large crack that develops by brittle deformation in the top 60 m of a glacier.
boulder or cobble that was picked up by a glacier and deposited
hundreds of kilometers away from the outcrop from which it detached.
- Scratches or troughs carved into rock by the sediment embedded in ice at the base of a flowing glacier.
- Permanently frozen ground.
- A deep, glacially carved, U-shaped valley flooded by rising sea level.
- A glacier that exists in or adjacent to a mountainous region.
- A bowl-shaped depression carved by a glacier on the side of a mountain.
- A vast sheet of ice that spreads over thousands of square kilometers of continental crust.
- A glacially carved tributary valley whose floor lies at a higher elevation than the floor of the trunk valley.
- A sediment pile composed of till deposited by a glacier.
- Our planet during periods in the Precambrian when its entire surface was ice covered.
phenomenon in which meltwater accumulates at the base of a glacier, so
that the mass of the glacier slides on a layer of water or on a slurry
of water and sediment.
interval of time in which the climate was colder than it is today,
glaciers occasionally advanced to cover large areas of the continents,
and mountain glaciers grew; an ice age can include many glacials and
glacially eroded hill that becomes elongate in the direction of flow
and asymmetric; glacial rasping smoothes the upstream part of the hill
into a gentle slope, while glacial plucking erodes the downstream edge
into a steep slope.
- A lake formed to the south of a continental glacier as a result of enhanced rainfall during an ice age.
- Ice formed by the freezing of the surface of the sea.
- A pointed mountain peak surrounded by at least three cirques.
- Dry-bottom glacier.
- A river or sheet of ice that slowly flows across the land surface and lasts all year long.
- A low, sinuous ridge of till that develops when the terminus (toe) of a glacier stalls in one position for a while.
circular depression in the ground made when a block of ice calves off
the toe of a glacier, becomes buried by till, and later melts.
- A polar landscape in which the ground splits into pentagonal or hexagonal shapes.
- A streamlined, elongate hill formed when a glacier overrides glacial till.
- Climate cycles that occur over tens to hundreds of thousands of years, because of changes in Earth's orbit and tilt.