Unit 5/6

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Across
  1. 2. a line on a chart that connects points representing samples of the same age, as determined by isotope ratios.
  2. 4. the equilibrium that exists between parts of the earth's crust, which behaves as if it consists of blocks floating on the underlying mantle, rising if material (such as an ice cap) is removed and sinking if material is deposited.
  3. 7. the process that occurs when two tectonic plates meet at convergent boundaries, and one of the plates moves under the other one due to gravity and differences in density.
  4. 10. a small, mostly rigid area of the Earth's lithosphere that moves independently, like a tectonic plate, but much smaller.
  5. 12. a tectonic boundary where two or more lithospheric plates are moving towards each other.
  6. 13. a linear shaped lowland between several highlands or mountain ranges produced by the action of a geologic rift.
  7. 15. a process in which a section of the earth's crust is folded and deformed by lateral compression to form a mountain range.
  8. 16. a large depression formed when a volcano erupts and collapses.
Down
  1. 1. formed by large-scale faulting, specifically when areas of Earth's crust are broken and displaced vertically, creating elevated blocks (horsts) and lowered blocks (grabens).
  2. 3. a type of volcano, a steep-sided hill or cone, formed by the accumulation of volcanic cinders (scoria) and other pyroclastic fragments around a volcanic vent.
  3. 5. the gradual movement of the continents across the earth's surface through geological time.
  4. 6. extensive areas of basaltic lava flows that erupt from fissures, covering vast areas of land and often forming plateaus.
  5. 8. a large body of igneous rock formed by the intrusion and solidification of magma below the Earth's surface.
  6. 9. a driving force for plate tectonics where the weight of cold, dense subducting plates pulls the rest of the plate along with it as they sink into the mantle.
  7. 11. a type of tectonic plate boundary where two lithospheric plates slide horizontally past each other.
  8. 14. a change in the Earth's magnetic field where the magnetic north and south poles switch places.