geology, The scientific study of the Earth’s physical structure, history, composition, and the dynamic processes that act upon it over time., uniformitarianism, The foundational geological principle stating that the same chemical, physical, and biological laws operating today have also operated throughout the geologic past. It is often summarized by the phrase, "The present is the key to the past.", deep-time view, The perspective that Earth’s history spans an immense stretch of time—approximately 4.54 billion years—implying that most geological features are the result of very slow processes acting over millions or billions of years., crust, The outermost, thinnest solid shell of the Earth. It is divided into low-density continental crust (primarily granitic rock) and denser oceanic crust (primarily basaltic rock)., Moho, (Mohorovičić Discontinuity): The boundary separating the Earth's crust from the underlying mantle. It is scientifically defined by a sharp, distinct increase in the velocity of seismic waves passing through it., mantle, The thick layer of hot, solid silicate rock located between the crust and the core. It makes up roughly 84% of Earth's total volume and behaves plastically over long periods., lithosphere, The rigid, brittle outer layer of the Earth that comprises the entire crust and the uppermost portion of the mantle. It is broken into the tectonic plates., core, The innermost, extremely dense central region of the Earth. It is composed primarily of an iron-nickel alloy and is divided into a liquid outer core and a solid inner core., natural resource, Any material, substance, or organism occurring in nature that humans can extract and use for economic gain, energy, or survival., renewable resource, A natural resource that can be replenished naturally at a rate equal to or faster than its consumption by humans (e.g., solar energy, wind, or sustainably managed timber)., nonrenewable resource, A natural resource that exists in finite quantities and cannot be replaced by natural means on a human timescale once exhausted (e.g., fossil fuels like coal, oil, and mineral ores)., resource management, The strategic planning, allocation, and control of natural resources to optimize their use while minimizing environmental degradation and ensuring long-term sustainability.

Science Chapter 4

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