Movement of Rock Formations

Movement of Rock Formations

Middle School

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Learning Objectives

• Describe the rock cycle and the three main types of rocks.

• Explain how heat and energy from the Earth and sun transform rocks.

• Analyze how plate motion, like uplift and subduction, changes rocks.

• Identify key processes like weathering, erosion, melting, and cooling.

Key Vocabulary

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Igneous Rock

Rock formed from the cooling and solidification of molten magma or lava.

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Sedimentary Rock

Rock formed from the compaction and cementation of layers of sediment over time.

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Metamorphic Rock

Rock that has been changed by extreme heat or pressure deep within the Earth.

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Magma

Molten rock material found beneath the Earth's surface, from which igneous rock is formed.

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Sediment

Small, solid pieces of material that come from rocks or living things.

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Weathering

The process that breaks down rock and other substances at Earth's surface.

Key Vocabulary

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Erosion

The process by which natural forces move weathered rock and soil from one place to another.

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Uplift

The process that moves rock from deep within the Earth up to the surface.

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Subduction

The process of one tectonic plate moving under another and sinking into the mantle.

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What Is the Rock Cycle?

• The rock cycle is how rocks are continuously created, changed, and destroyed.

• It connects the three main rock types: igneous, sedimentary, and metamorphic.

• Any type of rock can be transformed into any other rock type.

• The cycle is powered by heat from Earth's core and the sun.

Multiple Choice

What is the primary purpose of the rock cycle?

• To continuously create, change, and destroy rocks on Earth.

• To form only one specific type of rock.

• To prevent rocks from ever changing their form.

• To sort rocks based on their size and color.

Multiple Choice

What is the relationship between the three main rock types in the rock cycle?

• Any rock type can be transformed into another rock type.

• The three rock types are completely separate from each other.

• Igneous rock is the final form for all other rocks.

• Sedimentary rocks are the only ones that can change.

Multiple Choice

Based on the energy sources that power the rock cycle, what would happen if significant heat from Earth's core was no longer available?

• The process of creating and changing rocks would stop.

• The transformation of rocks would happen much faster.

• Only metamorphic rocks would continue to be formed.

• The sun would become the only source of rock formation.

The Three Major Rock Types

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Igneous Rock

• Formed when molten rock, called magma or lava, cools and solidifies.

• This cooling and hardening process is also known as crystallization.

• Common examples of igneous rocks include both granite and basalt.

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Sedimentary Rock

• Made from tiny particles of sand, shells, and other materials.

• These particles, known as sediment, build up in many layers.

• The layers harden into rock through compaction and cementation processes.

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Metamorphic Rock

• Formed when existing rocks are changed by intense heat and pressure.

• This process, called deformation, alters the rock's texture and minerals.

• Well-known examples of this type of rock are marble and slate.

Multiple Choice

What is the primary basis for classifying rocks as igneous, sedimentary, or metamorphic?

• By the processes that form them

• By the colors of their minerals

• By the regions where they are found

• By the types of fossils they contain

Multiple Choice

What is the key difference in the formation of igneous and sedimentary rocks?

• Igneous rock forms from cooling magma, while sedimentary rock forms from compacted sediment.

• Igneous rock is changed by pressure, while sedimentary rock is changed by heat.

• Igneous rock is made of shells and sand, while sedimentary rock is made of lava.

• Igneous rock is formed by crystallization, while sedimentary rock is formed by deformation.

Multiple Choice

If an existing rock is buried deep underground and subjected to intense heat and pressure without melting, which type of rock is most likely to form and why?

• An igneous rock, because the intense heat will cause it to melt into lava.

• A sedimentary rock, because the pressure will compact it into layers.

• A metamorphic rock, because the existing rock is altered by heat and pressure without melting.

• A mix of igneous and sedimentary rock, because both heat and pressure are present.

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How Sedimentary Rocks Are Formed

• The sun's energy drives processes that break down rocks (weathering).

• Wind, water, and ice carry away the broken rock pieces (erosion).

• These pieces, called sediments, are dropped in a new location (deposition).

• Layers are compacted and cemented together over time to form new rock.

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Multiple Choice

What process turns layers of sediment into solid sedimentary rock?

• Compaction and cementation

• Weathering and erosion

• Melting and cooling

• Sunlight and heat

Multiple Choice

What is the correct order of events that must happen before sediments can be compacted into rock?

• Weathering, erosion, then deposition

• Deposition, erosion, then weathering

• Erosion, deposition, then weathering

• Weathering, deposition, then erosion

Multiple Choice

A fast-moving river carries small pieces of rock downstream and empties into a large, calm bay. What would you predict would happen at the bottom of the bay over millions of years?

• New layers of sedimentary rock would form.

• The rock pieces would be washed away by the bay's currents.

• The rock pieces would be broken down further by the sun.

• The river would stop depositing any new pieces of rock.

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Subsurface Processes: Forging Igneous & Metamorphic Rock

Igneous Rocks

• ​Extreme heat deep within the Earth causes solid rock to melt and form a substance called magma.

• ​​When magma cools and solidifies, it undergoes crystallization to form new igneous rock.

• ​Slow cooling forms large crystals, while fast cooling of lava on the surface creates smaller crystals.

Metamorphic Rocks

• ​Existing rocks are subjected to intense heat and pressure deep within the Earth without melting.

• ​​These forces cause the rock's mineral crystals to rearrange and change their original texture.

• ​This process transforms a pre-existing rock into an entirely new metamorphic rock.

Multiple Choice

What is the fundamental process that forms igneous rocks?

• When magma cools and solidifies.

• When existing rocks are subjected to intense pressure.

• When mineral crystals in a rock are rearranged by heat.

• When lava on the surface cools and crystallizes.

Multiple Choice

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

• Igneous rocks are formed by slow cooling, while metamorphic rocks are formed by fast cooling.

• Igneous rocks form from molten material, while metamorphic rocks are changed without melting.

• Igneous rocks are created by pressure, while metamorphic rocks are created by heat.

• Igneous rocks have rearranged crystals, while metamorphic rocks have newly formed crystals.

Multiple Choice

A geologist finds an igneous rock with very large crystals. What can be concluded about how this rock was formed?

• It formed from lava that cooled quickly on the surface.

• It was an existing rock transformed by intense pressure.

• It formed from magma that cooled slowly.

• Its mineral crystals were rearranged without melting.

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The Role of Plate Tectonics: Uplift and Subduction

Uplift

• This geological process moves rock from deep within Earth's crust up to the surface.

• The collision of two continental plates can push up rock to form large mountain ranges.

• Once rocks are exposed, they can undergo weathering and erosion over long periods of time.

Subduction

• This process occurs when one tectonic plate sinks beneath another, pulling rock into Earth’s mantle.

• As the rock is pulled down, it experiences immense heat and pressure from the surrounding mantle.

• This can cause the rock to melt into magma or transform into new metamorphic rock.

Multiple Choice

What is the primary outcome of the geological process of uplift?

• It moves rock from deep within Earth's crust up to the surface.

• It pulls rock down into Earth's hot mantle.

• It causes rock to melt and turn into magma.

• It breaks down exposed rocks through weathering and erosion.

Multiple Choice

How does the process of subduction contribute to the creation of new rock or magma?

• By pushing up rock from the crust to form large mountain ranges.

• By exposing existing rock on the surface to weathering and erosion.

• By applying intense heat and pressure that can cause rock to melt or transform.

• By causing the collision of two large continental plates.

Multiple Choice

A rock is first brought to the surface during the formation of a mountain range. If the plate it is on later sinks into the mantle, what is the most likely sequence of events the rock will experience?

• The rock will be weathered at the surface, and then later transformed by heat and pressure.

• The rock will be transformed by heat and pressure, and then later weathered at the surface.

• The rock will immediately melt into magma, and then be pushed back to the surface.

• The rock will be pushed up into a mountain, and then immediately sink into the mantle.

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Common Misconceptions

Misconception	Correction
The rock cycle is a simple, circular path.	The rock cycle is a complex web; any rock can become any other.
Rocks do not change.	Rocks are constantly changing over vast spans of geologic time.
Metamorphic rocks have melted and cooled.	Metamorphic rocks change from heat and pressure but remain solid.
Weathering and erosion are the same thing.	Weathering breaks rocks down; erosion moves the pieces.

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Summary

• The rock cycle continuously changes rocks between igneous, sedimentary, and metamorphic types.

• Energy from the sun drives surface processes like weathering and erosion.

• Energy from Earth's interior drives processes like melting below the surface.

• Plate motion moves rocks, exposing them to different conditions.

• Any rock can transform into any other type of rock.

• Rock cycle changes happen over very long periods, known as geologic time.

Poll

On a scale of 1-4, how confident are you that you can describe the rock cycle to a friend?

• 1 - Not confident at all

• 2 - A little confident

• 3 - Mostly confident

• 4 - Very confident