Across
- 2. a large elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly parallel faults or fault systems.
- 4. a small area or region with a relatively hot temperature in comparison to its surroundings.
- 5. a fracture or zone of fractures between two blocks of rock.
- 8. a curved chain of volcanic islands located at a tectonic plate margin, typically with a deep ocean trench on the convex side.
- 12. a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.
- 13. under another, and collision, where two plates crash together.
- 14. formed where two tectonic plates pass laterally by one another
- 17. the quantity of something per unit volume, unit area, or unit length
- 18. the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
- 21. energy that moves from one place to another in a form that can be described as waves or particles
- 23. the formation of new areas of oceanic crust, which occurs through the upwelling of magma at midocean ridges and its subsequent outward movement on either side.
- 24. massive slab of solid rock made up of Earth's lithosphere (crust and upper mantle).
- 25. the movement of continents resulting from the motion of tectonic plates
- 26. a string of volcanoes and sites of seismic activity, or earthquakes, around the edges of the Pacific Ocean
Down
- 1. a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle
- 3. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
- 6. the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
- 7. the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
- 9. subduction, where one plate
- 10. occurs when two tectonic plates move away from each other
- 11. a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
- 15. hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed on cooling.
- 16. steep depressions in the deepest parts of the ocean
- 19. hot molten or semifluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this.
- 20. a supercontinent that incorporated almost all the landmasses on Earth
- 22. the quantity of something per unit volume, unit area, or unit length