Which agent of erosion created the U-shaped valley and the striations found in the flat rock on its floor? (1) Running water (3) Glacial ice (2) Mass.

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Presentation transcript:

Which agent of erosion created the U-shaped valley and the striations found in the flat rock on its floor? (1) Running water (3) Glacial ice (2) Mass wasting (4) Wind

Agents that erode also deposit.

Like eroding, depositing leaves clues… Some agents of deposition sort (arrange) sediments by: size, shape, or density. Some agents DO NOT sort.

Assorted non-native sediments. Mass Wasting & Glaciers do not sort. Unorganized deposits with no layers. Assorted non-native sediments. Local sediment.

Mass Wasting & Glaciers do not sort Mass Wasting & Glaciers do not sort. Unorganized deposits with no layers. Wind sorts out smaller sediments, leaving larger.

Mass Wasting & Glaciers do not sort Mass Wasting & Glaciers do not sort. Unorganized deposits with no layers. Wind sorts out smaller sediments, leaving larger. Water sorts AND layers sediment deposits.

Sorted or unsorted?

Sediments found in glacial moraines (deposits) are best described as (1) sorted and layered (2) sorted and not layered (3) unsorted and layered (4) unsorted and not layered

Sorted, layered sediments Water Sorted, layered sediments Look…they’re round!

Glacier Unsorted, unlayered, not-local sediments

Sorted sediments (no large sediment around!) Wind Sorted sediments (no large sediment around!)

Wind on Mars!

Glacier Unsorted, “erratic” (out-of-place) sediments

Sorted or unsorted?

NO! When water slows deposition occurs. Sediments that are carried begin to settle. Do all sediments settle at the same rate? NO!

Large sediments settle faster than smaller

Large sediments settle faster than smaller

Large sediments settle faster than smaller River’s mouth Ocean or Lake

Large sediments settle faster than smaller Denser particles settle faster than less dense

What if sediment is less dense than water? Large sediments settle faster than smaller Denser particles settle faster than less dense What if sediment is less dense than water?

Large sediments settle faster than smaller Denser particles settle faster than less dense Rounder particles settle faster than flatter

Each of the rock particles below has the same density and volume Each of the rock particles below has the same density and volume. Which particle will most likely settle at the fastest rate in moving water?