Chapter 9 -section 2 Flashcards
What is the major agent of erosion on Earth’s surface
Moving water
List these in order of size:
tributary, stream, rill, gully, runoff, river
Rill Gully Stream River tributary
Where would gullies be more likely to form:
a field with plowed soil and no plants or
a field covered with thick grass
explain
A field with plowed soil and no plants
What are five features that erosion forms along a river?
Valleys, waterfalls, floodplains, meanders, and oxbow lakes
What are three features that result from deposition along a river?
Alluvial fans
deltas
Soil on flood plain
Why does a Delta often Form where a River empties into the ocean?
Because the river water is no longer flowing downhill, the water slows down. At this point the sentiment in the water drops to the bottom which forms the delta.
What process is the cause of groundwater erosion?
Chemical weathering
How do groundwater erosion and deposition produce a limestone cave?
When water sinks into the ground it combines with carbon dioxide to form a weak acid called carbonic acid. Groundwater containing carbonic acid flows into any cracks in the limestone. Then some of the limestone changes chemically and is carried away in a solution of water
This process gradually hollows out pockets of rock forming Caves or caverns.
Runoff
Water that moves over surface
Rill
Tiny grooves in the soil caused by Runoff
Gully
A large groove or channel in the soil that carries runoff after a rainstorm
Stream
A channel along which water is continually flowing down a slope
Tributary
A stream or river that flows into a larger river
Flood plain
The flat wide area of land along a river
Meander
A loop like bend in the course of a river
