Variations in the flow of energy into and out of Earth’s systems result in changes in climate

Standards Alignment

• HS-ESS2-4 primary
  Use a model to describe how variations in the flow of energy into and out of Earth’s systems result in changes in climate.

Lesson Overview

This lesson explores how changes in the flow of energy into and out of Earth's systems cause changes in climate. Students will use scientific models to describe these variations and analyze evidence from Earth's systems over different timescales. The lesson aligns with NGSS standard HS-ESS2-4 and focuses on understanding climate change causes and effects through Earth and space science concepts.

Learning Objectives

• Describe how variations in the flow of energy into and out of Earth's systems cause changes in climate using scientific models.
• Analyze examples of climate change causes over different timescales, including volcanic eruptions, ocean circulation, human activities, and Earth's orbital changes.
• Explain the role of solar radiation and Earth's energy balance in climate systems.
• Use scientific vocabulary related to energy flow, climate, and Earth systems to communicate explanations.
• Interpret data and models to support claims about climate change and its impacts.

Success Criteria

• Students can accurately use models to explain how energy flow variations affect climate.
• Students identify and describe causes of climate change over short and long timescales.
• Students explain the processes of energy absorption, reflection, and re-radiation in Earth's systems.
• Students use appropriate scientific terms such as solar radiation, energy balance, and climate change in their explanations.
• Students analyze data or models and justify their conclusions about climate change causes and effects.

Prerequisite Knowledge

Students should understand basic Earth systems (atmosphere, ocean, land), the concept of energy flow and balance, and have prior experience interpreting scientific models and data.

Key Vocabulary

• Energy flow
• Climate change
• Solar radiation
• Earth's systems
• Energy balance
• Absorption
• Reflection
• Re-radiation
• Volcanic eruption
• Ocean circulation
• Orbital changes
• Atmosphere
• Glacial ice volumes
• Sea level

Materials and Resources

• Computer or projector to display models and data
• Printed or digital climate models and data sets
• Charts or diagrams of Earth's energy flow
• Graph paper or digital graphing tools
• Markers or colored pencils

Teacher Preparation

• Prepare or select models showing Earth's energy flow and climate variations over time.
• Gather data sets or visuals illustrating causes of climate change (e.g., volcanic eruptions, solar output changes).
• Review NGSS HS-ESS2-4 standard and related disciplinary core ideas.
• Prepare guiding questions to support student analysis and discussion.
• Set up technology for displaying digital media and interactive models.

Detailed Lesson Notes

Energy Flow in Earth's Systems

Energy from the sun enters Earth's systems primarily as electromagnetic radiation. This energy is absorbed, reflected, stored, and redistributed among the atmosphere, oceans, and land. The balance between incoming solar energy and outgoing energy re-radiated into space determines Earth's climate. Variations in this energy flow cause changes in climate patterns.

Causes of Climate Change Over Different Timescales

Climate changes can result from various causes depending on the timescale: - Short term (1-10 years): Large volcanic eruptions can inject ash and gases into the atmosphere, reducing solar radiation reaching the surface and causing cooling. Ocean circulation changes can redistribute heat. - Medium term (10-100s of years): Human activities, such as increased carbon dioxide emissions, alter atmospheric composition and affect climate. Changes in solar output also influence energy input. - Long term (10-100s of thousands of years): Changes in Earth's orbit shape and axial tilt affect the distribution and intensity of sunlight, driving ice ages and gradual climate shifts. - Very long term (10-100s of millions of years): Tectonic activity and atmospheric composition changes influence climate on geological timescales.

Modeling Climate Change

Scientific models represent Earth's energy flow and climate systems to help explain how variations cause climate changes. Models can include diagrams, computer simulations, or physical representations showing energy inputs, outputs, and storage. Using models helps students visualize complex interactions and predict climate responses to different energy flow scenarios.

Analyzing Data and Evidence

Students analyze data sets and models showing temperature changes, precipitation patterns, glacial ice volumes, and sea levels to understand climate change impacts. They learn to interpret graphs and maps, compare data over time, and use evidence to support explanations about causes and effects of climate variations.

Scientific Reasoning and Communication

Students practice using scientific vocabulary and reasoning to explain how energy flow variations affect climate. They develop written or oral explanations supported by evidence from models and data. This practice strengthens their ability to communicate scientific concepts clearly and accurately.

Worked Examples

Classroom Activity

Examine models and data, identify causes of climate change at various timescales, and discuss how energy flow changes relate to observed climate effects.

Guided Practice

Independent Practice

1. Foundational: What is the main source of energy that drives Earth's climate system?
2. Developing: Name two natural causes of climate change that can affect Earth's energy flow over short timescales.
3. Application: Using a model, explain how an increase in atmospheric carbon dioxide affects Earth's energy balance and climate.
4. Analysis: Compare how changes in Earth's orbit and human activities cause climate change through variations in energy flow.
5. Challenge: Interpret a model showing decreased solar output and increased volcanic activity. Predict the combined effect on Earth's energy flow and climate, and justify your reasoning.

Independent Practice Teacher Answer Key

1. 1. The sun is the main source of energy driving Earth's climate system.
2. 2. Large volcanic eruptions and changes in ocean circulation are two natural causes affecting energy flow over short timescales.
3. 3. An increase in carbon dioxide traps more heat energy in the atmosphere, reducing energy flow out to space, which causes Earth's climate to warm.
4. 4. Changes in Earth's orbit alter the distribution and intensity of solar energy over long timescales, causing gradual climate shifts, while human activities increase greenhouse gases, trapping heat and causing more rapid climate warming.
5. 5. Decreased solar output reduces incoming energy, and volcanic activity reflects sunlight, further lowering energy input. Together, they reduce energy flow into Earth's system, likely causing cooling of the climate.

Guiding Questions

• How does energy from the sun enter and leave Earth's systems?
• What causes changes in the flow of energy in Earth's systems?
• How do these energy flow changes affect climate over different timescales?
• Why are models important tools for understanding climate change?
• What evidence supports the connection between energy flow variations and climate changes?

Common Misconceptions

• Climate change is caused only by human activities; natural causes also play significant roles over various timescales.
• Energy from the sun always stays constant; in reality, solar output can vary and affect climate.
• Models are exact predictions rather than tools to represent and explore complex systems.
• Volcanic eruptions always cause warming; they typically cause short-term cooling by blocking sunlight.
• Climate change effects are immediate; some changes occur over very long timescales.

Differentiation

Assessment

• Ask students to describe how a volcanic eruption affects Earth's energy flow and climate using a model.
• Have students identify causes of climate change from data sets and explain their effects.
• Check student explanations for correct use of scientific vocabulary and reasoning.
• Explain in your own words how variations in energy flow cause changes in climate.
• List one natural and one human cause of climate change and describe their impact on energy flow.
• Analyze a new climate model showing changes in solar radiation and predict climate effects.
• Write a short essay explaining how Earth's orbit changes influence long-term climate patterns.

Answer Guide

• What is the main source of energy that drives Earth's climate system?
  Answer: The sun provides the energy that drives Earth's climate system.
• Name two natural causes of climate change that can affect Earth's energy flow over short timescales.
  Answer: Large volcanic eruptions and changes in ocean circulation.
• Using a model, explain how an increase in atmospheric carbon dioxide affects Earth's energy balance and climate.
  Answer: Increased CO2 traps more heat, reducing energy flow out of Earth and causing warming.
• Compare how changes in Earth's orbit and human activities cause climate change through variations in energy flow.
  Answer: Earth's orbit changes affect solar energy distribution over long timescales, causing gradual climate shifts; human activities increase greenhouse gases, trapping heat and causing faster warming.
• Interpret a model showing decreased solar output and increased volcanic activity. Predict the combined effect on Earth's energy flow and climate, and justify your reasoning.
  Answer: Both decreased solar output and volcanic activity reduce energy input to Earth, leading to cooling of the climate.

Real-Life Application

Encourage students to discuss with family members how human activities at home (like energy use) can affect Earth's energy balance and climate, and suggest ways to reduce carbon footprints.

Homework or Home Connection

• Encourage students to discuss with family members how human activities at home (like energy use) can affect Earth's energy balance and climate, and suggest ways to reduce carbon footprints.

Lesson Summary

This lesson helped students understand that Earth's climate changes when the flow of energy into and out of its systems varies. They learned to use models to describe how natural events like volcanic eruptions, changes in Earth's orbit, and human activities alter energy flow, causing climate changes over different timescales. By analyzing data and constructing explanations with scientific vocabulary, students developed a deeper understanding of the complex interactions driving Earth's climate system.

Teacher Notes

Use the exact standards alignment and retrieved-source provenance stored with this enrichment.

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