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1. I chose this image because I saw the hole in the rock and remembered that wind could erode away pieces of rock gradually over time creating holes or divots in rocks.
2. Wind caused this erosion by over time slowly taking away small dust particles until it created a hole.
3. It has changed physically because what used to be a solid rock now has holes in it.

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1.i chose this picture because it shows erosion from wind. the wind blue up the wall and slowly eroded the walls into this shape. this was caused by weathering.
2. i think that wind was what caused this erosion.
3. i think that the land has changed by becoming rounded and walled.

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1. I chose this picture because it had obvious evidence of wind erosion and it looks cool.
2. I think that wind blew the sand in different directions creating the different stripes and lines of sand.
3. I think the land has changed physically because of the wind moving the sand into a different position.

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1. I chose this picture because the arches are defined evidence of weathering through water.
2. The forces that cause this weathering are wind and water. The water slowly wore down on the rock and the wind helped weather the rock into the arch shape.
3. The land changed physically because the rock probably didn't have the arches when it was first formed. however, when it was introduced to water, it started to weather and form the arches

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1.  I chose this image because there is a large arch which is evidence of weathering.
2. The force that caused this happening is wind. The wind blew against it. Over time it wore away at the rock.
3. It change physically because the rock slowly was wore away over time. The rock likely didn't form that way.

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1. I chose this because it is a good example of chemical weathering through chemical reactions in the lichen
2.the forces are the lichen growing on the log and then decaying it to get to nutrients and minerals inside of the log
3. the log has changed from the lichen because the lichen decays the log to get the nutrients inside of it so the log can die or get smaller from the lichen eating away at it

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Weathering Erosion
1. I choose this picture because it shows weathering erosion. You can see from the formations of rock couldn't form like that on their own. 2. It had to be done by erosion caused by wind or water, because of the unusual formation and the striped rock
3. I think the land has changed from being a flat piece of land to have canyons and rock formations caused by water or wind

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1. I chose this picture because it is clear that physical erosion caused this monstrosity of a canyon, because of the carvings and shapes.
2. Over many years wind, water, and lava caused the grand canyon. But it all started with a lake the was let loose, over time it carved what you see today.
3. After many years the land changed physically from rocky mountains to flat lands. After the flat lands were created, a giant lake broke away from it's place, and eventually created a ginormous canyon.

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1. I chose this picture because you can clearly see the lichen growing out of the rock, showing chemical erosion.
2. the forces that cause the weathering are bacteria and fungi inside the rock that grow and expand. As this happens the rock weakens and splits allowing the lichen to expand farther.
3. This changed the land by crumbling and breaking down rocks that could cause land slides or different rock formations.

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1. I chose this picture because I knew it was chemical weathering, I saw the fungi which made me think it was chemical weathering because I know that fungi would break down the rock through chemical weathering
2. I think that when the fungi grows chemicals from the fungi break down the rock
3. I think this has caused the land to change because more and more rocks are breaking down which causes different rock formations with fungi on them

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Water Erosion
1. I chose this image because it look like a split in the earth from the water flowing through it.
2. I think the forces causing the erosion is the water making the ground soft and easy to move with the water.
3. I think the land has changed by splitting in two parts from the water rushing through making its own path.

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1.  I chose this picture because it clearly shows how the water has eroded the land, creating a deep indent in the land.
2.  I think that water has eroded the land because there is water in the bottom, and where the land has been eroded it it is wet.
3. The land has changed, because the water has been rushing through creating a large indent, and eroding the land.

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1: I chose it because the ocean is constantly physically weathering the rock. It washes over the rock and weathers small pieces off.
2: The forces weathering and eroding the rock is the ocean. It weathers it by washing over it, and then carrying the pieces away.
3: The land has changed physically because the land around the rock pillar has been weathered away. the pillar has gotten smaller because of the weathering and erosion.

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Weathering Erosion-
1. I chose this because It shows other physical factors that caused the rock to arch and have an open middle.
2. Other factors that caused weathering/erosion is wind, temperature change, and water (rain).
3. The land changed physically because the factors (wind, temperature change, water) changed the rock below, and formed the arch.

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Rusty chain
1. I chose this because I knew that rust was an example of chemical weathering. The reddish, flakiness on the chains made me think that it was chemical weathering.
2. When water and oxygen make contact with the metal iron, a chemical called iron oxide forms on the outside of the metal and turns to a reddish brown color.
3. The iron changed chemically to have a layer of iron oxide on the outside.

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1. I chose the Grand Canyon because it shows weathering by water erosion when the river goes through the canyon because it eroded through the canyon.
2. The force that caused the erosion was water erosion. I think this because most canyons are carved by the erosion of freezing and unfreezing water.
3. The land has changed because there is now a canyon that goes deep into the ground.

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I chose this picture because this is a product of physical weathering because the rock is cracked and looks weathered.
2. I think this was caused either by wind weathering it down or water freezing and expanding to crack the rock or salt water when the water evaporates and the salt crystals expand in the rock.
3.I think the land has changed from erosion because the rocks are scattered and changes the landscape.

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I chose it because I know that rust is an example of chemical weathering. The weathering was caused by oxidation making a chemical reaction when the iron in the nail and oxygen interact. The nail was changed by rust which is a chemical reaction meaning that the nail was changed by chemical weathering.

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1. I chose this picture because the rock is covered in lichen. I know that lichen erodes  rocks.
2. The forces acting on this rock are chemical because lichen weathers rocks by means of secreting a rock breaking chemical.
3. The land has changed chemically because over time, the lichen will break the rock down and smooth the landscape out.

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1. I chose the Rio Grande, because I felt like it was a good representation of physical weathering. It's a good example because it's deep into a canyon, which was probably weathered into the ground from the river.
2. I think the constantly moving water caused the erosion, as the river is close to the equator, so it can't be frozen and expand that way. Also, there seems to be a flat plateau on either side of the river, so it leads me to believe that the river, over time, carried sediment and rocks, creating the canyon that surrounds it.
3. I think the land went from a flat expanse of land with a small river running across it, to gradually over millions of years, into the large canyon and river it is now. It has changed because of physical weathering, because water is a physical force that has changed the land. The land went from a long expanse of flatter land to the river and canyon.