Deposition is the process where ______ _________ ______ ___ ____ __________ ________ .
eroded sediments settle and form geological features.
WEATHERING is defined by the breaking down of sediments. When these sediments are transported, it is considered EROSION. What must happen next in order for these sediments to be deemed as having gone through DEPOSITION?
After being transported, the sediments must come to rest and be deposited somewhere
When sediments are deposited, what do they always form?
Geological features
What is one of the most common geological features formed by deposition?
A delta
Why does a river fan out into a delta?
Because when the river's high velocity meets the ocean's low velocity, the sediments from the river lose their energy, and are at the mouth of the river (eventually forming the islands that make up a river delta).
_______ sediments settle to the bottom faster than _______ sediments because ___________________.
larger, smaller, they have more mass
Flatter and smoother sediments settle to the bottom _____er than angular sediments.
fast
2 round sediments of equal volume are placed in a river. Sediment B reaches the bottom first. Why does this happen?
because sediment B has a higher density than sediment A
More dense rocks settle to the bottom slower than less dense rocks. True or False?
False, they settle faster
What type of rocks are the most likely to be deposited closest to the mouth of a stream?
E) Larger, denser, rounder rocks
The sediments at the bottom of a river are Vertically Sorted from smaller to larger size sediments. What does this say about the relative sea level at the time they were deposited?
It signifies that during the period of time between the deposition of the smaller and larger sediments, the relative sea level DROPPED
When a riverbed's Vertical Sediment Sorting goes from _______ to _______ sediments, one knows that the relative sea level had risen in between the times of their depositions.
larger, smaller
An area of low-lying ground is a adjacent to a river. It is formed mainly by river sediments. What is this called?
a Floodplain
When a ridge of sediment is deposited naturally alongside a river by overflowing water, it is called a _________.
Levee
What geological feature marks the outer edges of a floodplain?
A bluff line
Why do Flood Plains have deep fertile soil?
Because they are constantly subject to flooding by the river they surround.
In deep water, the amount of wave action ___creases with depth, while, in shallow water, wave action ___creases with depth.
decreases, increases
How do sandbars form?
Sandbars form when water velocity slows, causing sand sediments to deposit.
Near beaches, what happens to sandbars that eventually causes them to become barrier islands?
The amount of sediment they accumulate from the sand on the beach is so much that they eventually reach the surface of the water.
What is the term for mounds of unsorted sediments that pile up at the outer edges of Glaciers?
Moraines
A flat area formed by fine sands and smaller sorted sediments that is deposited by meltwaters from a glacier is called a _______________.
Outwash plain
What geological feature shows where a glacier has stopped advancing foward?
A Terminal Moraine
What geological feature gives the Summit School it's name?
Its location at the "summit" of the Harbor Hills Moraine (one of the two moraines on long island).
A low oval mound or small hill that consists of compacted boulder clay molded by past glacial action is called a __________.
Drumlin
How are Kettle Lakes formed?
Kettle Lakes are formed when a block of ice from a glacier falls, forms a depression, and melts.
What process creates the geological feature of Sand Dunes?
Wind Deposition
Which material is most likely to be transported in suspension during periods of slower stream velocity?
B) clay
More deposition than erosion will take place in a stream bed when the
C) velocity of the stream decreases
Which is the most probable description of the energy of a particle in an erosional-depositional system?
C) Particles gain kinetic energy during erosion and lose kinetic energy during deposition
Deltas form where
D) stream velocity is reduced
In moraines, which kind of sediments settle on the top?
The larger sediments
What happens to sea level during an ice age?
It drops
What are the characteristics of sediments in a moraine?
They are unsorted and fragmental.
With _________________s, the sediments are sorted randomly, while with ____________________s the sediments are sorted by size.
moraines, outwash plains
Why do glaciers deposit both rounded and angular sediments?
Because when they cross paths with a river, they pick up round sediments that later on mix with the glaciers' angular sediments.
What created the Montauk Bluffs?
The Ronkonkoma Moraine
Moraines are deposited on a flat glacier-formed surface called a(n) __________.
outwash plain
What are outwash plains a result of?
They are a result of glaciers melting and receeding.
What happens when torrents of melt-water pour out of a continental glacier?
An outwash plain is created
What happens when torrents of melt-water pour out of a mountain glacier?
Rivers are created
What is the term for large sediments (cobbles, and boulders) deposited on the top of a moraine?
Glacial erratics
What is an example of a glacial erratic?
A boulder sitting in the middle of central park that looks out of place for its surroundings.
What happens that forms a drumlin?
A glacier goes over a pre-existing morain, and changes its shape by forcefully compacting the sediments into a rounder shape
__________ only can tell the general direction of the glacier, while ________ point in the direction the glacier came from, or went to.
striations, drumlins
Author
mglicc
ID
61283
Card Set
earth science depositon
Description
Flash cards for Mr. Colon's 9th grade Earth Science class packet on deposition
