UNITS 40 AND 41

False

Channels on alluvial fans never change courses.

true

Deltas commonly form where streams empty into larger bodies of water such as lakes and oceans.

False

Ephemeral streams flow year round.

levee

Flood deposits made up of the coarsest material forms a(n) ___along the flooded river.

the river floods and deposits sediment on its margins

Floodplains form when:

Formation of midstream bars diverts the flow of water around its bar

How do braided streams form?

on the outer parts of the bend

In meandering rivers, erosion occurs:

birdfoot

The Mississippi Delta is an example of a delta.

at the apex of the fan

The coarsest sediment deposited on an alluvial fan is found:

Incised terraces form when a stream cuts through and leaves parts of its former floodplain as benches above the modern floodplain

The difference between an incised delta and a fill terrace is:

During large floods, water covers much of the floodplain. As water spills out of the channel, coarse deposits are deposited closest to the channel banks.

The following statement best describes the formation of natural levees.

Nile Delta

The geographic location displaying a classic triangular-shaped delta is:

an apron

The shape of the alluvial fan most closely resembles:

false

The shape or form of the delta is not influenced by stream discharge.

fertile soils, flat land, and access to nearby water

What are some of the reasons humans build on floodplains?

oxbow lake

What kind of lake forms when a meander is cut off?

bajada or alluvial apron

When alluvial fans coalesce along a mountain front obscuring the cone shape, a(n) _____ forms.

on the outside

Where on a meander is erosion the greatest?

tectonic uplift which steepens channels, decreased sediment yield into the stream, and a drop in base level on tributaries of a larger stream

Which of the following will lead to the development of stream terraces?

waves, tides, and currents

Which process influences the shape or form of a delta?