Flows, Cycles, and Conservation TEKS
K-2
5.E Identify forms of energy and properties of matter
3
5.E Investigate the flow of energy and cycling of matter through systems
4-5
5.E Investigate how energy flows and matter cycles through systems and how matter is conserved
6-8
5.E Analyze and explain how energy flows and matter cycles through systems and how energy and matter are conserved through a variety of systems
The concept of Flows, Cycles, and Conservation is a crosscutting scientific principle that helps explain the movement and transformation of matter and energy in various systems. It encompasses the understanding of how substances, information, and energy flow through different processes, undergo cyclic patterns, and adhere to principles of conservation.
Flows
- refer to the movement of matter, energy, or information from one place to another or within a system. Flows can occur at different scales, from the microscopic level of particles to the global scale of Earth's systems. Examples of flows include the movement of water in rivers, the transfer of energy through electrical circuits, or the transmission of information in communication networks.
Matter flows involve the movement of substances such as water, nutrients, gases, or chemicals. These flows are crucial in ecological systems, Earth's biogeochemical cycles, and industrial processes.
Energy flows involve the transfer and transformation of energy from one form to another. This can include the flow of thermal energy, electromagnetic radiation, or electrical energy. Understanding energy flows is essential in fields such as physics, engineering, and environmental science.
Information flows pertain to the transmission and exchange of data or signals. This can include communication networks, information processing in the human brain, or the transfer of genetic information in biological systems.
Cycles
- refer to the recurring patterns or sequences of events that involve the continuous transformation and movement of matter, energy, or information. Cycles often involve feedback loops, where outputs from one part of the cycle become inputs for another part. Cycles can be found in natural systems, human activities, and various scientific domains.
Biogeochemical cycles, or the cycle of matter, such as the carbon cycle, nitrogen cycle, and water cycle, involve the movement and transformation of elements and compounds between living organisms, the atmosphere, land, and water bodies.
Climate cycles, such as El Niño-Southern Oscillation (ENSO), describe long-term patterns in Earth's climate systems.
Conservation
- refers to the principle that certain properties, quantities, or values remain constant or are preserved throughout various processes or interactions. Conservation laws apply to different aspects, such as mass, energy, momentum, angular momentum, and charge. These conservation principles help scientists understand the fundamental properties and behaviors of systems.
The principle of conservation of mass states that the total mass of a closed system remains constant over time, regardless of physical or chemical changes that may occur within the system.
The principle of conservation of energy, often referred to as the first law of thermodynamics, states that energy cannot be created or destroyed but only transformed from one form to another.
The principle of conservation of momentum states that in a closed system, the total momentum before an event or interaction is equal to the total momentum after the event. This principle is crucial in understanding collisions, motion, and the behavior of objects.
Understanding flows, cycles, and conservation is essential in various scientific disciplines, including ecology, physics, chemistry, geology, and systems thinking. It helps scientists analyze and model systems, make predictions, and develop sustainable practices. By recognizing the patterns and principles governing the movement and transformation of matter, energy, and information, scientists can gain insights into the functioning of natural and human-made systems.
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