Matter and Energy in Earth's System

Matter and Energy in Earth's System

Middle School

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Learning Objectives

• Describe how Earth's materials cycle through melting, crystallization, weathering, and sedimentation.

• Explain how energy moves matter between the geosphere, hydrosphere, atmosphere, and biosphere.

• Analyze how interactions between Earth's spheres can change the planet's surface over time.

• Tell the difference between positive and negative feedback loops in Earth’s systems.

Key Vocabulary

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Atmosphere

The atmosphere is the protective envelope of gases that surrounds the planet Earth, keeping us safe.

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Geosphere

The geosphere consists of all the solid and rocky parts of our planet, including mountains and soil.

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Hydrosphere

The hydrosphere contains all of the water on Earth, such as in oceans, rivers, and glaciers.

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Biosphere

The biosphere is the global ecosystem that is composed of all living organisms and their environments.

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Weathering

Weathering is the natural process that breaks down rocks and other materials on the Earth’s surface.

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Sedimentation

Sedimentation is the process of depositing sediment, like sand and rock, by wind, water, or ice.

Key Vocabulary

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Crystallization

Crystallization is the natural process where atoms arrange themselves into a well-defined, solid crystal structure.

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Deformation

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

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Melting

Melting is the process where a solid substance turns into a liquid when heated to its melting point.

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Energy

Energy is the power to do work or cause changes, such as making things move or heat up.

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System Feedback

System feedback is information that is returned to a system which can then cause changes in its behavior.

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Earth's Four Spheres

Geosphere & Hydrosphere

• The Geosphere is the rock and metal part of the Earth, from the hot core to the rocky crust.

• It is made up of layers: the inner core, outer core, mantle, and the crust we live on.

• The Hydrosphere includes all water, from liquid in oceans and rivers to the frozen ice and snow.

Atmosphere & Biosphere

• The Atmosphere is the layer of gases surrounding Earth, containing our weather and the air we breathe.

• It is mainly made of nitrogen and oxygen, and is the foundation for different climates on Earth.

• The Biosphere contains all living organisms, which are found in almost every part of our planet.

Multiple Choice

What are the four major components that make up the Earth system?

• The inner core, outer core, mantle, and crust.

• The Geosphere, Hydrosphere, Atmosphere, and Biosphere.

• The oceans, rivers, ice, and snow.

• The nitrogen, oxygen, weather, and climates.

Multiple Choice

What is the primary reason living organisms in the Biosphere depend on the Atmosphere?

• The Atmosphere provides the solid rock and metal for shelter.

• The Atmosphere contains the air that most organisms need to breathe.

• The Atmosphere includes all the frozen ice and snow on the planet.

• The Atmosphere is made up of the hottest layers of the Earth's core.

Multiple Choice

A volcanic eruption sends large amounts of rock and ash into the air. This material is then carried by wind and settles into oceans and rivers. Which statement best describes this chain of events?

• The Biosphere is causing changes in the Geosphere and Hydrosphere.

• The Hydrosphere is causing changes in the Atmosphere and Biosphere.

• The Geosphere is causing changes in the Atmosphere and Hydrosphere.

• The Atmosphere is causing changes in the Geosphere and Biosphere.

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Energy in the Earth System

Solar Energy

• Solar energy is heat that comes from the sun and travels to our planet.

• This energy is the main driver for processes that happen on the Earth's surface.

• It powers our weather, the water cycle, and even the process of erosion.

Internal Heat

• Internal heat is the energy from the Earth's extremely hot core and mantle.

• This energy drives processes that happen deep below the Earth's surface.

• It is responsible for melting rocks and causing the movement of continents.

Multiple Choice

What is the main source of energy for processes like weather and the water cycle that happen on the Earth's surface?

• Solar energy

• Internal heat

• The water cycle

• The movement of continents

Multiple Choice

What is the relationship between the Earth's internal heat and geological processes?

• It drives processes deep below the Earth's surface.

• It is the main driver for weather and erosion.

• It comes from the heat of the sun.

• It powers the water cycle on the planet.

Multiple Choice

If the Earth's internal heat were to significantly decrease, which of the following events would be the most likely consequence?

• The movement of continents would slow down or stop.

• The Earth's weather patterns would disappear.

• The water cycle on the surface would stop.

• The process of erosion would no longer occur.

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Earth’s Internal Energy and Rock Formation

• Energy from Earth's hot interior drives major geological processes below the surface.

• The mantle's intense heat can melt solid rock into liquid magma.

• As magma cools, it crystallizes and solidifies to form igneous rocks.

• Heat and pressure can reshape rocks, creating metamorphic rocks without melting.

Multiple Choice

What provides the energy that drives the rock cycle deep underground?

• The heat from Earth's interior

• The light from the Sun

• The pressure from ocean water

• The force of the wind

Multiple Choice

How does the cooling of magma lead to the creation of a new type of rock?

• When rocks are broken down by wind

• When liquid magma cools and forms crystals

• When sand and shells get pressed together

• When rocks are changed by pressure without melting

Multiple Choice

If a rock is subjected to intense heat and pressure deep within the Earth but does not melt, what is the most likely outcome?

• It will become an igneous rock because it was exposed to heat.

• It will become magma because it is deep inside the Earth.

• It will become a metamorphic rock because it was changed by heat and pressure but did not melt.

• It will stay the same type of rock because it did not melt.

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Sun Energy and the Rock Cycle

• Energy from the sun drives the processes that cycle rocks on Earth’s surface.

• Solar energy causes weather, like wind and rain, which breaks down rocks.

• Wind and water carry away the small rock pieces, called sediments, through erosion.

• Layers of sediment build up and form sedimentary rocks over millions of years.

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Multiple Choice

What provides the energy for weather, such as wind and rain, that shapes the surface of the Earth?

• The Sun

• The Earth's core

• The Moon's gravity

• Heat from volcanoes

Multiple Choice

What is the relationship between the sun's energy and the formation of sediments?

• It causes weather like wind and rain that breaks down and moves rock pieces.

• It directly melts large rocks into liquid magma.

• It helps plants grow, and their roots break apart rocks.

• It creates magnetic fields that pull rocks apart.

Multiple Choice

If wind and water continuously deposit sediments in a specific location over millions of years, what is the most likely outcome?

• Layers of sediment will build up and form sedimentary rock.

• The rock pieces will be washed away, leaving the area unchanged.

• A mountain will form from the pressure of the water.

• The sediments will be broken down into sand.

The Water Cycle

• The sun's heat turns liquid water into water vapor.

• The water vapor cools and rises, forming clouds.

• Water falls back to Earth as rain or snow.

Multiple Choice

Which statement best describes the water cycle?

• The process of water moving between the Earth and the sky.

• The process of the sun heating the Earth.

• The process of clouds forming in the atmosphere.

• The process of water freezing into ice.

Multiple Choice

What is the role of the sun in the water cycle?

• It provides the heat energy needed to turn liquid water into water vapor.

• It causes water vapor to cool down and form clouds.

• It pushes the clouds across the sky.

• It directly causes rain and snow to fall from the clouds.

Multiple Choice

Based on the steps of the water cycle, what would most likely happen if water vapor did not cool as it rises?

• The sun would stop heating the water.

• Rain and snow would fall continuously.

• Clouds would not be able to form.

• Liquid water would immediately freeze.

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System Interactions and Feedback

Positive Feedback

• Positive feedback is a process that reinforces and speeds up a change in a system.

• For example, as ice melts, the darker ocean or land underneath is exposed to sunlight.

• This darker surface absorbs more solar energy, which in turn leads to even more melting.

Negative Feedback

• Negative feedback is a process that slows down a change, helping to stabilize a system.

• For instance, a rise in global temperatures can cause more water to evaporate from oceans.

• This can lead to more cloud cover, which reflects sunlight back into space and causes cooling.

Multiple Choice

What is the primary role of positive and negative feedback processes in a system?

• To reinforce or slow down changes within the system.

• To stop all changes from happening in the system.

• To introduce new sources of energy to the system.

• To remove all interactions from the system.

Multiple Choice

How does the example of melting ice illustrate a positive feedback process?

• The initial melting causes changes that lead to even more melting.

• The melting of ice helps to stabilize the Earth's temperature.

• The darker ocean surface reflects all sunlight, slowing the melting.

• The process of melting ice creates more ice somewhere else.

Multiple Choice

A rise in temperature causes more clouds to form. If these clouds then block sunlight and cause temperatures to cool, what does this scenario demonstrate?

• A system being stabilized by negative feedback.

• A system being sped up by positive feedback.

• A process that is unrelated to temperature.

• A permanent change that cannot be reversed.

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Common Misconceptions

Misconception	Correction
Earth's spheres work independently of each other.	All of Earth's spheres are connected and affect one another.
Changes to Earth's surface happen very quickly.	Major changes like mountain building take place over millions of years.
'Positive' feedback is always good for the environment.	It reinforces change, which can sometimes have harmful effects.
Melting sea ice is the main cause of rising sea levels.	The main cause is melting ice sheets on land.

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Summary

• Earth is a system of four interconnected spheres: atmosphere, geosphere, hydrosphere, and biosphere.

• Energy from the sun and Earth's interior drives the flow of matter.

• The rock and water cycles describe the continuous movement of matter.

• System feedback influences stability, and geological changes are very slow.

Poll

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

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