Presentation on theme: "Landforms Investigation 1: Schoolyard Models Investigation 2: Stream Tables Investigation 3: Go with the Flow Investigation 4: Build a Mountain Investigation."— Presentation transcript:
Landforms Investigation 1: Schoolyard Models Investigation 2: Stream Tables Investigation 3: Go with the Flow Investigation 4: Build a Mountain Investigation 5: Birds Eye View
Investigation 1: Schoolyard Models Model- a representation of an object or process Boundary- the limit or border of an area or region Structure- something built by people, like a building Map- drawing of an area Cartographer- person who makes maps Grid- network of vertical and horizontal lines that form squares
Investigation 1: Schoolyard Models What information can be included on a map? Maps show roads, structures, and landforms as seen from above How did you use the grid to help you make a map of your schoolyard model? The grid identifies the position of buildings and other features on the map.
Investigation 1: Schoolyard Models Symbol- color, shape, or texture used to represent something else on a map, such as a building, road, or landform. Key- an explanation of symbols used on a map Why is it important to include a key on a map? A map key explains what the symbols mean on a map
Investigation 2: Stream Tables Drainage basin- system of rivers and streams that drains an area like the Colorado Plateau Erosion- involves 2 processes –Weathering- wearing away by water, wind, ice –Transport- movement of materials to new locations by water, wind, or ice
Investigation 2: Stream Tables Landform- shape or feature of the Earths surface Canyon- a V-shaped valley eroded by a river or stream Delta- fan shaped (triangular) deposit of earth materials at a mouth of a stream Plateau- large, nearly level area that has been lifted above the surrounding area
Investigation 2: Stream Tables What happens when a river flows over a flat surface like a plateau? Water flowing over earth materials may erode them. What are some of the landforms that can be created by rivers? Rivers can create landforms called canyons and deltas. Where does most of eroded earth material end up after the water moves through the stream table? Sand forms the delta, and clay ended up in the basin
Investigation 2: Stream Tables Why do you think the sand was deposited at the bottom and the clay on top of the vial when it was shaken? The sand is heavier and settled to the bottom first when the shaking stopped. Where does water slow down first in the stream table? The water starts to slow down near or at the mouth of the stream. You can observe the movement of the water by watching the particles it carries along.
Investigation 2: Stream Tables How does the result of the shake test explain why the sand and clay were deposited in different places in your stream table? The sand is heavier, so it is deposited first. The clay is carried farther before its deposited because its lighter. A canyon is created by erosion A delta is created by deposition
Investigation 2: Stream Tables Why does water move back and forth in a channel? Water always flows to the lowest place. Water will move around barriers if possible. Deposition- process by which eroded earth materials settle out in another place Sediments- eroded earth materials that have been deposited
Investigation 2: Stream Tables Basin- low area in which sediments are often deposited Channel- course or path the water takes in a stream or river Meander- curve or loop in a channel What happens to earth materials that have been eroded by a river? They are deposited as sediments in a basin
Investigation 2: Stream Tables Which earth materials are deposited first as water in a river slows down? Heavier earth materials are deposited first (sand then clay) What happens to water flowing in a river? It moves back and forth following the lowest channel How could the Colorado River have formed the Grand Canyon? It might have eroded earth materials that make up the Colorado Plateau
Investigation 3: Go with the Flow Slope- angle or slant of a stream channel or land surface Alluvial fan- fan-shaped landform deposited at the end of a steep canyon where the slope becomes flatter. Fans are usually found in arid regions like Death Valley
Investigation 3: Go with the Flow What differences did you observe in the landforms when the slope increased? The canyons were deeper; the deltas were larger and longer. Water flowing through channels with steep slopes causes more erosion How did slope affect the time it took for landforms to appear? Material eroded faster in the slope tray, so the canyon took less time to form.
Investigation 3: Go with the Flow What happens to flood waters when they reach another body of water like a lake? Water slows and material is deposited. A delta forms Where did you see a delta in your stream table? Where the stream reached the pool of water. What might happen in the Grand Canyon when there is a flash flood? More erosion might occur, and the canyon might become deeper.
Investigation 3: Go with the Flow What might make water in a stream channel slow down? The slope might become more flat. The water might run into a lake or ocean What would you expect to see where slope changes? Eroded earth materials would be deposited. A delta or alluvial fan could form.
Investigation 3: Go with the Flow How can you use what you know about flooding and increased volume of water to explain why rivers could flow more quickly over a flatter slope as they approach their mouths? At its mouth a river is probably carrying a greater volume of water because other streams in its drainage basin have joined it along the way
Investigation 3: Go with the Flow Flood- a very heavy flow of water which is greater than the normal flow of water and goes over the streams normal channel Flash Flood- rises and falls rapidly with little or no advance warning. It is usually the result of a very heavy rainfall over a relatively small area. Flash floods can be caused by sudden heavy rainfall, dam failure, or an ice jam thaw
Investigation 3: Go with the Flow What differences did you observe in the landforms when you used the flood water source? The canyons were wider and straighter; the deltas were larger and longer. More material eroded What differences did you notice in how long it took for features to form in the standard flood setups? The material started to erode earlier in the flood setup. Most events happened earlier.
Investigation 3: Go with the Flow Levee- embankment along a stream that protects land from flooding. Levees can be manmade or natural Dam- construction or wall across a river that holds back the water flowing through the river, creating a reservoir or lake. Floodplain- area around a river that is covered by water flowing over the riverbank during a flood
Investigation 3: Go with the Flow What are the different ways people use to control the flow of water in a river or stream? They build dams, levees, and new channels for the river
Investigation 4: Build a Mountain Base- bottom of a mountain Contour line- line on a topographic map that connects points of equal elevation Contour interval- difference in elevation between contour lines Elevation- vertical distance or height above sea level Sea level- average height of oceans surface- zero elevation Topographic map- uses contour lines to show the shape and elevation of the lands surface
Investigation 4: Build a Mountain What is a contour line and where is it used? Contour lines show the shape and elevation of the land on a topographic map If a topographic map has many contour lines spaced close together, what does that tell you about the lands surface in that area? The slope of the land is steep
Investigation 4: Build a Mountain Profile- side view or cross-section of a landform such as a mountain What kind of information can you get about a landform by looking at its profile? Profiles give a side view of a landform. They are a way to picture the slope of a mountain
Investigation 4: Build a Mountain Bench Mark- surveyors marker usually placed permanently in the ground at a known position and elevation Intermittent stream- has water flowing in it only during certain times of the year Perennial stream- always has water flowing in it
Investigation 4: Build a Mountain What kind of information do you usually get from a topographic map? Topographic maps give information about elevation and the shape of the land. Symbols and patterns on a key can give information about certain types of landforms such as intermittent and perennial streams
Investigation 5: Birds Eye View Ridge- narrow area of high land between two valleys Glacier- large mass or body of moving ice Valley- low area between higher areas through which a river or stream often flows Interpret a map- figure out the symbols, textures, colors, and patterns to put together an image of the land covered by the map
Investigation 5: Birds Eye View Aerial photograph- picture of the earths surface taken from an airplane or spacecraft flying above the earth Scale- describes the ration between a measured distance on a map to the actual distance in the real world Surveyor- measures and marks the distance, elevation, position, and boundaries of land areas
Investigation 5: Birds Eye View Bar scale- ruler line on a topographic map that shows the scale Representative fraction- tells the scale of a map as a ration between distance on a map to distance in the real world What kind of information do you get from an aerial photograph? Aerial photos give an actual picture of the earths surface, so you can see the trees, valleys, bodies of water, and more
Investigation 5: Birds Eye View What are some ways aerial photos might be used? Surveyors can use them to record their measurements. Cartographers use these measurements and aerial photos to help them draw topographic maps Rapids- part of a river channel where the water moves rapidly over obstacles, such as large boulders. This is a landform on the Colorado River in the Grand Canyon
Investigation 5: Birds Eye View Intermittent Lake- contains water only during certain times of the year, such as the rainy season. This is a landform in Death Valley What kinds of features can you view on a topographic map and aerial photos? Landforms, other natural features, and human constructions
Investigation 5: Birds Eye View How can you tell you are looking at the same feature on a topographic map as you are on an aerial photo? You need to find similar landmarks on both. For example, alluvial fans are fan-shaped on the photos. The contour lines on a topographic map are also fan-shaped or parts of concentric circles