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27 Cards in this Set
- Front
- Back
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The earth is in constant motion.
True or false. |
True
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Describe 3 motions of plate tectonics
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Pushing together.
Pulling apart. Sliding side by side. |
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What's a tectonic plate?
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A rigid moving piece of lithosphere.
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How many tectonic plates are there?
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7 major
Many minor |
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What are the 4 types of plate boundaries?
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Convergent subduction.
Convergent collision. Divergent. Transform. |
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What are oceanic plates?
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Plates mostly consists of water.
If the edges of 2 plates are oceanic. |
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What do oceanic plates form?
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Deep ocean trenches.
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What happens when oceanic plates meet continental plates?
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The oceanic plate subducts.
Tsunamis, volcanic arcs, deep focus earthquakes. |
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What happens when 2 continental plates meet?
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Neither subducts.
Forms mountains, large mountain belts, earthquakes, some volcanism |
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What are divergent plate boundaries?
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Pulling away.
Oceanic rifts. (Valley in ocean floor) Ridges on both sides of rift. Weak earthquakes. |
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What plates meet at convergent subduction boundaries?
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Oceanic plates and continental plates (where the oceanic plate subducts)
Or 2 oceanic plates (where the older ocean floor subducts) |
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What plates meet at convergent collision plates?
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2 continental plates that don't subduct
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Crust is being created and destroyed at boundaries
True or false. |
True.
Destroyed: convergent subduction boundaries Created: divergent boundaries |
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Continents are stationary.
True or false. |
False. Continents move over time.
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Who is Abraham Ortelius?
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A cartographer of the 1600s
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When and who presented the idea of scientific drift?
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Alfred Wegener, 1912
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What is Wegener suggesting?
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That the supercontinent Pangaea broke up and drifted into their current positions.
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Who is Alfred Wegener?
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A meterologist, a planetary scientist, suggested continental drift.
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Name 4 pieces of evidence that supports continental drift
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- Jigsaw fit of continents
- Fossils that fit - Geologic structures such as mountain belts - Ancient Climates (ice ages) |
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Why was Wegener's theory not accepted?
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Because the theory lacked a driving mechanism.
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What are 3 things they found on the ocean floor?
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- Oceanic trenches
- Oceanic ridges - Ocanic rocks that are younger than expected |
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Crust is continually being formed at mid-ocean ridges.
True or false? |
True
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At what rate does the sea floor spread?
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2 inches per year
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Why does earth behave like a bar magnet?
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Earth behaves like a bar magnet due to the rotation of liquid outer core.
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As basalt cools, magnetic minerals are aligned with....
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North and south magnetic poles.
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Where are the reversals recorded?
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On the ocean floor in mirrored belts.
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More evidence for Plate Tectonics
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- Polar Wandering
- Earthquake Patterns - Hotspots |
