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g7 3.4
7th Grade STEMscopes CA Segment 3 Scope 4
Question | Answer |
---|---|
Convergent Boundary | A place where two tectonic plates move toward each other and collide |
Crust | The thin, solid, outermost layer of Earth; is either continental (landmasses) or oceanic (ocean floors) |
Divergent Boundary | A place where two tectonic plates move away from each other |
Magma | Melted, or molten, rock material beneath Earth’s surface; cools slowly to form rocks with larger crystals |
Mid-Ocean Ridge | An underwater mountain system formed by plate tectonics; the largest single volcanic feature on Earth |
Ocean Basin | A depression of Earth’s surface in which an ocean lies |
Seafloor Spreading | A phenomenon by which magma from Earth’s mantle comes up at the mid-ocean ridge and creates new oceanic crust |
Subduction | The process in which a denser plate is pushed downward beneath a less dense plate when plates converge |
Tectonic Plate | Huge piece of crust that slowly moves on the upper, ductile part of the mantle |
Trench | Deep and narrow depression in the seafloor where the subducted plate moves into the asthenosphere |
Competition | When more than one individual or population in an ecosystem relies on the same limited resources |
Dynamic | Characterized by constant change, activity, or progress |
Ecosystem | A system comprising all the biotic and abiotic factors in an area and all the interactions among them |
Ecosystem Dynamics | Interrelated changes among the biotic and abiotic factors in an ecosystem over time |
Population | A group of interacting individuals of the same species located in the same area |
Resilience | The ability of an organism, population, community, or ecosystem to persist in the face of stressful or changing conditions |