Week 11

10/30/23 

After we discussed our homework article we began to look at the ages of layers of rocks, fault lines, and erosions. 

Erosion and Deposition

wind, water, glacier

characteristics of sand

sand made through water is polished, smooth, and generally similar in size.

sand made through wind is opaque, frosted, pitted, and very fine-grained.

sand made through glaciers is polished, smooth, but irregular in size.

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the first sand we investigated we believed to be water because they were polished and similar in size. (green black colored)

the second sand we investigated we believed to be made through wind because of the pitted, very fine grains. (felt like dust/flour)

the third sand we investigated we believed to be through glaciers because they were very irregular in size.

the fourth sand we also believed to be made through glaciers due to its very irregular size. 

the sixth wind we believed to be wind because of its frosted and pitted look. 

the seventh sand we investigated we believed to be made through water because the grains were very polished.  (from Iowa river)

the eighth sand we investigated we believed to be water because the multicolored grains were polished and similar in size. 

the ninth sand we investigated we found to be made through water and glacier because they were polished but sort of irregular in size. (From Iceland)

the tenth sand we investigated we believed to be made through glaciers because of its irregular size

the eleventh sand we believe to be made through water because it was very polished and most of the grains of sand were very similar in size. (oolitic sand, it's the only sand that grows. Water goes inside of it and expands it)

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wind erosion key characteristics:

1. wind shadows: areas behind an object where wind speed slows down and material is deposited

2. carves the earth

characteristics of water erosion:

1. Young rivers carve down, have lots of energy, and tear apart the land, eroding all that it can due to energy from gravity. (does not have to do with the age of the river)

    - white water

    - boulders

    -fast flowing

2. old rivers meander from side to side, have less energy, and carry fine sediment (Mississippi river)

characteristics of glacier erosion:

two kinds of glaciers

- mountain

-continental 

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