Implement this Lesson:
This lesson is best used in conjunction with other environmental and ecosystem lessons.
Learning Objective:
- Students will understand the four main Earth spheres: biosphere, hydrosphere, atmosphere, and geosphere.
- Students will explore how these spheres interact in the context of saltwater wetlands.
- Students will analyze the importance of these interactions in maintaining the health of wetland ecosystems.
Texas Essential Knowledge and Skills (TEKS)
6.11(A) research and describe why resource management is important in reducing global energy poverty, malnutrition, and air and water pollution
6.11(B) explain how conservation, increased efficiency, and technology can help manage air, water, soil, and energy resources
6.12(A)* investigate how organisms and populations in an ecosystem depend on and may compete for biotic factors such as food and abiotic factors such as availability of light and water, range of temperatures, or soil composition
6.12(B) describe and give examples of predatory, competitive, and symbiotic relationships between organisms, including mutualism, parasitism, and commensalism
6.12(C) describe the hierarchical organization of organism, population, and community within an ecosystem
6.13(A) describe the historical development of cell theory and explain how organisms are composed of one or more cells, which come from pre‐existing cells and are the basic unit of structure and function
6.13(B) identify and compare the basic characteristics of organisms, including prokaryotic and eukaryotic, unicellular and multicellular, and autotrophic and heterotrophic 6.13(C) describe how variations within a population can be an advantage or disadvantage to the survival of a population as environments change
7.10(A)* describe the evidence that supports that Earth has changed over time, including fossil evidence, plate tectonics, and superposition 7.10(B)* describe how plate tectonics causes ocean basin formation, earthquakes, mountain building, and volcanic eruptions, including super volcanoes and hot spots
7.11(A)* analyze the beneficial and harmful influences of human activity on groundwater and surface water in a watershed
7.11(B)* describe human dependence and influence on ocean systems and explain how human activities impact these systems
7.12(A)* diagram the flow of energy within trophic levels and describe how the available energy decreases in successive trophic levels in energy pyramids
7.13(A)* identify and model the main functions of the systems of the human organism, including the circulatory, respiratory, skeletal, muscular, digestive, urinary, reproductive, integumentary, nervous, immune, and endocrine systems
7.13(C)* compare the results of asexual and sexual reproduction of plants and animals in relation to the diversity of offspring and the changes in the population over time
7.13(D)*describe and give examples of how natural and artificial selection change the occurrence of traits in a population over generations
7.14(A) describe the taxonomic system that categorizes organisms based on similarities and differences shared among groups
8.10(A) describe how energy from the Sun, hydrosphere, and atmosphere interact and influence weather
8.10(B) identify global patterns of atmospheric movement and how they influence local weather
8.10(C) describe the interactions between ocean currents and air masses that produce tropical cyclones, including typhoons and hurricanes
8.12(B) describe how primary and secondary ecological succession affect populations and species diversity after ecosystems are disrupted by natural events or human activity
8.12(C) describe how biodiversity contributes to the stability and sustainability of an ecosystem and the health of the organisms within the ecosystem
8.13(A) identify the function of the cell membrane, cell wall, nucleus, ribosomes, cytoplasm, mitochondria, chloroplasts, and vacuoles in plant or animal cells 8.13(C) describe how variations of traits within a population lead to structural, behavioral, and physiological adaptations that influence the likelihood of survival and reproductive success of a species over generations
8.13(B) describe the function of genes within chromosomes in determining inherited traits of offspring
Earth’s Four Spheres in Saltwater Wetlands
Saltwater wetlands are special places where all four Earth spheres work together. These spheres are like different “systems” that make Earth a great place to live.
Biosphere — All Living Things
This includes plants, animals, and tiny organisms.
| In Wetlands | Why It’s Important |
|---|---|
| Marsh grasses, fish, crabs, oysters, birds, and microorganisms | Living things depend on water, soil, and air to survive and help keep the wetland healthy. |
The biosphere brings life and energy to wetlands!
Hydrosphere — All Water on Earth
This includes oceans, rivers, lakes, groundwater, and even ice.
| In Wetlands | Why It’s Important |
|---|---|
| Saltwater and brackish water (mix of fresh and salt water) | Water allows plants and animals to live, grow, and find food. |
The hydrosphere keeps wetlands wet and full of life!
Atmosphere — All the Air Around Earth
This includes gases like oxygen and carbon dioxide.
| In Wetlands | Why It’s Important |
|---|---|
| Wind, rain, air for breathing, weather | Plants need air to make food, and animals need air to breathe. Weather brings rain and influences tides. |
The atmosphere gives wetlands air, weather, and energy!
Geosphere — Rocks, Soil, and Land
This includes solid Earth — rocks, dirt, sand, and landforms.
| In Wetlands | Why It’s Important |
|---|---|
| Mud, sand, soil, and the coastline | Mud holds plant roots and provides homes and nutrients for animals. |
The geosphere forms the foundation of wetlands!
How They Work Together in Wetlands
Saltwater Wetlands = All Four Spheres Teaming Up 💪🌿
-
Water (hydrosphere) flows over soil (geosphere)
-
Plants and animals (biosphere) grow and live in the water and soil
-
Air and weather (atmosphere) affect tides, storms, and plant growth
Each sphere depends on the others — just like teammates!
Quick Summary Table
| Sphere | Meaning | Wetland Example |
|---|---|---|
| Biosphere | Living things | Fish, crabs, plants |
| Hydrosphere | Water | Saltwater and tides |
| Atmosphere | Air | Wind, oxygen, weather |
| Geosphere | Land/Soil | Mud, sand |
Lesson Plan:
Engage:
- Begin with a brief discussion on what students know about Earth’s spheres.
- Show a short video or presentation on the four spheres: biosphere, lithosphere, atmosphere, and hydrosphere. (BrainPop)
- Define each sphere and provide examples of each.
Explore/Explain:
- Use chart paper to create a visual map of the four spheres.
- Ask students to suggest examples of interactions between the spheres (e.g., plants [biosphere] growing in soil [geosphere], air [atmosphere] providing oxygen for animals [biosphere], etc.).
- Focus the discussion on saltwater wetlands
Expand:
- Divide students into small groups.
- Provide students with their observation sheet of biotic and abiotic factors in the saltwater wetlands.
- Instruct groups to complete the Earth’s Spheres worksheet. Each student should label the four spheres, identify where the biotic and abiotic factors from their previous observations belong.
- Have students fill in the arrows on the worksheet identifying how factors from the spheres interact with one another.
Evaluate:
- Students present their worksheet.