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What does the term erosion mean? Example: Due to erosion in the area, the beach is closed. The sand is slipping away and becoming very unstable.
Erosion is the changing of the land's shape due to the movement of weathered bits of earth to another place. When wind and water pick up bits of rocks, dirt, and debris from the ground, they bring them to new locations. This movement changes the shape of the land and creates new landforms.
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Erika's class is submitting ideas to help stop beach erosion. The beach has large rocks that are exposed, and the sand seems to be washing out to sea, which leaves very little beach behind.
Which idea of Erika's seems most reasonable and practical to slow wind and water form changing the shape of the land?
Beach erosion is widespread and changes the shape of the land forever. The most reasonable and practical way to slow the wind and water would be to bring in sand to rebuild the beach; this will add more shoreline and help to strengthen the coast. Then they can build barriers in the water to help break some of the waves before they reach the shore, so there isn't as much force pounding into the rocks and sand. This should help slow some of the erosion and stop the land from changing.
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Liam's teacher announced, "I have made a hill with sand. You are going to get to take a turn making "wind" by blowing into a straw." The students predict that the sand will blow all over the place, breaking up the hill. His teacher gives them a challenge.
What can you build to slow the wind from changing the shape of our landform?
This classroom investigation is very much like the real process of erosion that happens in the natural world. The students' production that the "wind" will blow the sand everywhere is correct. The best option to prevent the changing of the landform is to build a wall in front of the hill. Building the wall behind it still leaves the hill exposed and will not help. Also, making a river will not stop the "wind" from blowing, so it is not a good option. A wall would be secure and take the gust of wind instead of the hill, thus saving it from breaking apart.
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The sides of a river are falling because of the water racing through a narrow section of the river. The town council is trying to decide how they can slow the water down and control it, so the shape of the river doesn't change and cause more problems.
Which solution is the best option?
Many towns face a similar problem to this because moving water is so strong. The force of the water can cause the riverbanks to change shape, which can be dangerous if there are buildings or homes constructed right along the river. The best option would be to build a dam upstream that would stop the water flow downstream. The town could control how much water passes through the dam so that the damage can be limited. This solution could slow the erosion and stop the changing of the land's shape.
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London was eating a lollipop and noticed how it was getting smaller and smaller, and depending on how he licked it; the shape was even changing.
What is this example similar to in the natural world?
London's simple example of eating a lollipop is very much like wind and water, changing the shape of the land. As waves crash into the shore of a beach, they move sand away and expose rocks that change the way the area looks. Rivers often rush through canyons carving the sides into new shapes and sights. Licking the lollipop is wearing it down and changing the shape.
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Which solution would be best and most reasonable for slowing wind and water from changing the shape of the land?
The best and most reasonable choice for slowing wind and water from changing the shape of the land would be to bring in new sand or dirt to fill in areas that have started to wear away. Erosion is the movement of materials that have been broken down, so bringing in new sand or dirt can help slow the water and wind from changing the landform.
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Which factor(s) can change the shape of the land?
All of these listed answer choices are correct. Wind, water, and plants all change the shape of the land through weathering and erosion. When the land changes, it can cause problems for humans and the environment. Sometimes humans have to intervene and help fix what nature has created.
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Aanya's class is submitting ideas to help stop erosion on a riverbank. The riverbank has houses nearby, and the soil is slipping into the river. There are exposed tree roots, and they seem to be the only thing holding the bank in place.
Which idea of Aanya's seems most reasonable and practical to slow wind and water form changing the shape of the land?
Erosion is widespread and changes the shape of the land forever. The most reasonable and practical way to slow the wind and water would be to add more trees and plants along the bank. The additional trees and plants will help stabilize the soil and keep it from sliding and moving. This should help slow some of the erosion and stop the land from changing.
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Patricia's teacher announced, "I have made a hill with rocks, sand, and dirt. You are going to get to make "rain" by pouring water down the hill." The students predict that the sand, dirt, and rocks will flow down the hill and break it up. Her teacher gives them a challenge.
What can you build to slow the water from changing the shape of our landform?
This classroom investigation is very much like the real process of erosion that happens in the natural world. The students' prediction that the "rain" will blow the sand, rocks, and dirt everywhere is correct. The best option to prevent the changing of the landform is to build barriers to block the water, dirt, sand, and rocks from sliding. This will help prevent the land from changing shapes.
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What does the term weathering mean? Example: Due to weathering, the house cannot be occupied. The foundation is unstable, and the rocks are loose.
Weathering is the process of wind, water, and vegetation breaking apart rocks and other natural materials. The house in the example is unstable because the rocks below the foundation have been beaten by rain and wind and broken apart.
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