CPSB Plate Motion 25-26 CRITICAL JUNCTURE
Flashcard
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Science
•
8th Grade
•
Hard
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1.
FLASHCARD QUESTION
Front
What is the theory of plate tectonics?
Back
The theory of plate tectonics explains the movement of Earth's lithosphere, which is divided into tectonic plates that float on the semi-fluid asthenosphere beneath them. This movement is responsible for many geological phenomena, including earthquakes, volcanic activity, and the formation of mountains.
2.
FLASHCARD QUESTION
Front
What evidence supports the theory of continental drift?
Back
Fossil evidence, such as similar species found on different continents, geological formations, and the fit of continental shapes, supports the theory of continental drift.
3.
FLASHCARD QUESTION
Front
What is continental drift?
Back
Continental drift is the hypothesis that continents have moved over geological time and were once joined together in a single landmass called Pangaea.
4.
FLASHCARD QUESTION
Front
What is seafloor spreading?
Back
Seafloor spreading is the process by which new oceanic crust is formed at mid-ocean ridges and older crust moves away from the ridge, driven by convection currents in the mantle.
5.
FLASHCARD QUESTION
Front
What role do convection currents play in plate tectonics?
Back
Convection currents in the mantle cause the movement of tectonic plates. Hot material rises, cools, and then sinks, creating a cycle that pushes plates apart or pulls them together.
6.
FLASHCARD QUESTION
Front
What is the significance of fossil evidence in geology?
Back
Fossil evidence helps geologists understand the historical distribution of species and supports theories like continental drift by showing how similar species existed on now-separated continents.
7.
FLASHCARD QUESTION
Front
How do the shapes of continents support the theory of plate tectonics?
Back
The shapes of continents, such as the fit of South America and Africa, suggest they were once connected, supporting the idea of continental drift and plate tectonics.
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