Surface Features in the Geosphere

Surface Features in the Geosphere

Middle School

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Learning Objectives

• Define topography using elevation, relief, and landforms.

• Explain how energy from the sun and Earth’s interior shapes the geosphere.

• Differentiate between constructive and destructive forces that change Earth’s surface.

• Describe how Earth’s materials are cycled over very long timescales.

Key Vocabulary

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Topography

Topography describes the detailed shape and features of the land's surface in an area.

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Landform

A landform is any natural feature on the Earth's surface, such as a mountain or valley.

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Mountain

A mountain is a large landform with high elevation and significant relief rising above the surrounding land.

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Weathering

Weathering is the natural process of breaking down rocks, soil, and minerals through contact with the atmosphere.

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Erosion

Erosion is the process that moves pieces of rock or soil from one place to another.

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Sedimentation

Sedimentation is the process of eroded materials like rock and soil settling in a new location.

Key Vocabulary

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Deformation

Deformation is the process by which rocks change their shape due to stress and pressure.

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Crystallization

Crystallization occurs when molten rock, called magma or lava, cools down and solidifies into crystals.

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Matter Cycling

Matter cycling is the continuous process where materials are reused and converted into different forms.

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Surveying

Surveying involves measuring and mapping distances and angles on the Earth’s surface for construction purposes.

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Model

A model is a simplified representation used to understand complex real-world objects or systems.

Topography of the Geosphere

• Topography describes the shape of the land's surface.

• Elevation is height above sea level; relief is the difference in elevation.

• Landforms are natural features shaped by their elevation and relief.

Multiple Choice

What does the term 'topography' describe?

• The shape of the land's surface

• The types of rocks in the ground

• The weather patterns in an area

• The location of oceans

Multiple Choice

What is the relationship between elevation and relief?

• Relief is the difference in elevation between the highest and lowest points in an area.

• Elevation is another word for the relief of a particular landform.

• Relief and elevation are independent measurements that are not related.

• Elevation measures the shape of the land, while relief measures the height.

Multiple Choice

Which of the following best describes how landforms are classified?

• By the types of plants and animals found there

• By their elevation and relief compared to surrounding areas

• By the amount of rainfall they receive each year

• By the type of soil and minerals present

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Constructive and Destructive Forces: Shaping Our Planet

Constructive Forces

• These are forces that are responsible for building up land and creating brand new landmasses.

• For example, the collision of tectonic plates pushed up the ocean floor to form the Himalayan mountains.

• Volcanic eruptions are also a constructive force as they can build up new layers of land.

Destructive Forces

• These are the forces that are responsible for wearing down or destroying the Earth's existing landmasses.

• Forces such as wind, rain, ice, and fire cause weathering and erosion, which wear down land.

• A volcanic eruption can also be a destructive force, destroying habitats with lava and ash.

Multiple Choice

What is the primary difference between constructive and destructive forces?

• Constructive forces build up land, while destructive forces wear it down.

• Constructive forces are caused by volcanoes, while destructive forces are caused by wind.

• Constructive forces happen quickly, while destructive forces happen slowly.

• Constructive forces are found on land, while destructive forces are found in water.

Multiple Choice

How can a volcanic eruption be considered both a constructive and a destructive force?

• It causes tectonic plates to collide and also causes erosion.

• It can build new layers of land with lava while also destroying habitats with ash.

• It only builds new land and does not cause any destruction.

• It only destroys habitats and does not create any new land.

Multiple Choice

The formation of the Himalayan mountains involved the collision of tectonic plates. Which statement best explains why this is considered a constructive process?

• The process created a new landmass by pushing up the ocean floor.

• The process was caused by weathering and erosion from wind and rain.

• The process destroyed a large area with lava and ash.

• The process was a very fast and sudden geological event.

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Energy That Drives Geologic Change

Energy From Inside Earth

• The planet's extremely hot core generates a huge amount of heat energy.

• This internal energy drives constructive forces, which build up landforms on Earth’s surface.

• It causes rock to melt, bend, and break to create new mountains and volcanoes.

Energy From The Sun

• Energy from the sun is the main driver of our planet's weather patterns.

• This external energy powers destructive forces, which wear down landforms on Earth’s surface.

• It causes wind and water to move, leading to the weathering and erosion of rock.

Multiple Choice

What are the two main sources of energy that cause major changes to Earth's landforms?

• Energy from Earth's core and energy from the sun

• Energy from wind and energy from water

• Energy from volcanoes and energy from mountains

• Energy from weather and energy from erosion

Multiple Choice

What is the main difference between the effects of energy from Earth's core and energy from the sun?

• Energy from the core builds up landforms, while energy from the sun wears them down.

• Energy from the core causes wind and rain, while energy from the sun melts rock.

• Energy from the core powers destructive forces, while energy from the sun powers constructive forces.

• Energy from the core creates weather patterns, while energy from the sun forms volcanoes.

Multiple Choice

Over many years, a large rock formation is broken down into smaller pieces by wind and rain. Which statement provides the best explanation for this change?

• External energy from the sun is powering destructive forces that cause weathering.

• Internal energy from the planet's core is causing the rock to melt and bend.

• External energy from the sun is driving constructive forces to build a new landform.

• Internal energy from the planet's core is creating new weather patterns.

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The Cycling of Earth's Materials

• Earth's materials are always being recycled, changing from one rock type to another.

• Weathering and erosion break down rocks on the surface into smaller sediment pieces.

• These sediment pieces settle and build up in layers to form sedimentary rock.

• Deep inside Earth, heat can melt rock into magma, which cools into igneous rock.

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Multiple Choice

What is the main principle of the cycling of Earth's materials?

• Earth's materials are constantly changing from one type to another.

• All rocks on Earth are formed from cooled magma.

• Weathering and erosion only happen deep inside the Earth.

• Sedimentary rock is the final form for all of Earth's materials.

Multiple Choice

What is the key difference between how sedimentary and igneous rocks are formed?

• Sedimentary rock forms from layered sediments, while igneous rock forms from cooled magma.

• Sedimentary rock is created by heat, while igneous rock is created by pressure.

• Sedimentary rock is made from magma, while igneous rock is made from sediment.

• Sedimentary rock is formed on the surface, while igneous rock is formed only underground.

Multiple Choice

Based on the processes described, what would most likely happen to a rock that is carried deep inside the Earth?

• It will be broken down by weathering and pressed into sedimentary rock.

• It will likely melt due to heat, become magma, and then cool to form igneous rock.

• It will be immediately compacted by pressure to form sedimentary rock.

• It will be eroded by underground water and carried to the surface.

Major Landforms: Mountains, Plateaus, and Plains

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Mountains

• A landform that features both high elevation and very high relief.

• A mountain range is a large group of related mountains together.

• A mountain belt is a long chain of mountain systems.

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Plateaus

• This landform has a high elevation but has very low relief.

• It is very high above sea level but is mostly flat.

• Rivers and streams may sometimes cut deep into its flat surface.

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Plains

• A landform characterized by its low elevation and very low relief.

• They are large, flat areas that are not high above sea level.

• A coastal plain is a type of plain that lies along a seacoast.

Multiple Choice

What are the two main characteristics used to define landforms like mountains, plateaus, and plains?

• Elevation and relief

• The types of rivers and streams

• Whether they are near a seacoast

• The number of mountains in a group

Multiple Choice

Which statement best compares a mountain and a plateau?

• Both have high elevation, but mountains have high relief while plateaus have low relief.

• Both are completely flat, but mountains are at a higher elevation than plateaus.

• Mountains are single landforms, while plateaus are always found in groups.

• Plateaus have high relief, while mountains have low relief.

Multiple Choice

An airplane flies over a large, flat area that lies along a seacoast. It then flies over a very high, flat-topped region where a river has cut a deep canyon. What two landforms did the plane fly over, in order?

• A coastal plain, then a plateau

• A mountain range, then a coastal plain

• A plateau, then a mountain belt

• A mountain, then a plain

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The Slow Pace of Geological Change

• Processes that build and erode landforms are extremely slow.

• ​These changes happen over millions of years, a geological timescale.

• To us, mountains and canyons appear stable and unchanging.

• However, they are always in a constant state of slow change.

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Multiple Choice

What is the main characteristic of the geological processes that build and erode Earth's landforms?

• They happen very quickly, often overnight.

• They are extremely slow, taking place over millions of years.

• They only happen during major events like earthquakes.

• They stopped happening a long time ago.

Multiple Choice

Why might a person observe a mountain for their whole life and believe it is not changing?

• Because mountains are made of rock that cannot change.

• Because the changes are too slow to be noticed within a human lifetime.

• Because erosion only happens to smaller landforms like hills.

• Because all geological changes on the mountain are finished.

Multiple Choice

A scientist states that a large canyon is in a 'constant state of slow change.' What conclusion is best supported by this statement?

• The canyon will look noticeably different within the next year.

• The canyon was formed quickly by a single event and is now stable.

• The canyon is being shaped by forces, but the process is not visible on a day-to-day basis.

• The changes are happening, but only deep underground.

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What Are Topographic Maps?

• A topographic map shows an area's surface features, like elevation, relief, and slope.

• ​Contour lines on the map connect points that have the same elevation.

• Closely spaced lines mean a steep slope; widely spaced lines mean a gentle slope.

• Closed loops show hills, while V-shaped lines can show ridges or valleys.

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Multiple Choice

What is the main purpose of a topographic map?

• To show the locations of roads and cities.

• To show an area's surface features, like elevation and slope.

• To show the daily weather patterns of a region.

• To show the political boundaries between countries.

Multiple Choice

On a topographic map, what is the relationship between widely spaced contour lines and the land they represent?

• The slope of the land is very steep.

• The slope of the land is gentle.

• The area is the top of a hill.

• There is a valley or a ridge.

Multiple Choice

If you were looking for a hill that is easy to climb, what features would you look for on a topographic map?

• A closed loop with closely spaced contour lines.

• A closed loop with widely spaced contour lines.

• A series of V-shaped lines pointing uphill.

• A series of V-shaped lines pointing downhill.

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Common Misconceptions

Misconception	Correction
Mountains are permanent and do not change.	Landforms are constantly changing due to constructive and destructive forces.
All flat land is the same.	A plain is a flat area with low elevation, while a plateau has high elevation.
Rocks are permanent and cannot change from one type to another.	The rock cycle can transform any rock into another type.
Topographic maps are just drawings of hills.	Topographic maps use contour lines to show a landform’s exact elevation.

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Summary

• Earth's topography is shaped by constructive forces from internal energy and destructive forces from the sun.

• Matter cycling, through processes like weathering and melting, constantly recycles Earth's materials.

• Key landforms such as mountains, plateaus, and plains are defined by elevation and relief.

• Geological changes happen very slowly; we use tools like topographic maps and GPS to map them.

Poll

On a scale of 1-4, how confident are you about the concepts covered in today's review?

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