Lesson 12B Science quiz

abrasion

the process by which wind-driven sand erodes exposed rock

deflation

the action of wind over a large area to remove small clastic particles, leaving behind cobbles and larger rocks that form desert pavement

dune

a depositional landform that results from wind-deposited sand and soil

glacier

a large mass of dense, compacted snow and ice that flows downhill under the influence of gravity

loess

a thick deposit of fine, windblown dust and silt that provides an excellent base for rich soil

mass wasting

the process by which gravity transports rock and soil downhill

moraine

a sedimentary ridge or surface formed by glacial till after a glacier melts or retreats

till

The sediments deposited directly by a glaciers melting

creep, slump, landslide

three major types of mass wasting

very slow downhill movements of sediments and soil

explain creep

fast but short downhill movements of sediments and soil

explain slump

large, fast, far downhill movements of sediments and soil started by a trigger

explain landslide

earthquakes and excessive amounts of water

two most common triggers of landslides

suspension, saltation, rolling

the three ways that streams move sediments

tiny particles of silt, clay, and fine sand flow along with the water

explain suspension

larger sediment particles bounce repeatedly over the stream bottom as they are carried along by the flow

explain saltation

larger rocks roll along the bottom of the stream

explain rolling

the smallest sediments go closer to the mouth of a river because of the speed of streams

how and why streams sort sediments based on their size

when it snows more than it melts

How do glaciers form?

continental- Greenland

alpine- Switzerland

two types of glaciers and give an example of where each type is located on earth

slope, thickness, type of rock

three factors that influence the speed of a glacier's downhill movement