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Across
  1. 3. most often used to refer to the valley of the East African Rift, the divergent plate boundary which extends from the Afar Triple Junction southward through eastern Africa, and is in the process of splitting the African Plate into two new and separate plates.
  2. 5. a place where two of the Earth’s tectonic plates move past one another. As these plates move past one another, the two plates interact and can create cracks or faults within the surrounding area.
  3. 6. a place where two tectonic plates meet.
  4. 9. a series of mountains or hills ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arisen from the same cause, usually an orogeny.
  5. 12. the zone of volcanic activity surrounding the Pacific Ocean.
  6. 14. 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 sea-floor spreading. An example is the Mid-Atlantic Ridge.
  7. 18. Earth's tectonic plates converge and the older, denser plate is pushed beneath the lighter plate and deep into the mantle, causing the seafloor and outermost crust (the lithosphere ) to bend and form a steep, V-shaped depression.
  8. 19. is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.
  9. 21. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
  10. 22. destructive plate boundary, is an actively deforming region where two tectonic plates or fragments of lithosphere move toward one another and collide.
  11. 23. 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.
  12. 24. the oceanic lithosphere and some continental lithosphere is recycled into the Earth's mantle at convergent boundaries. Where the oceanic lithosphere of a tectonic plate converges with the less dense lithosphere of a second plate, the heavier plate dives beneath the second plate and sinks into the mantle.
Down
  1. 1. a point, line, or value. Biology The evolution of superficially similar structures in unrelated species as they adapt to similar environments.
  2. 2. a submarine ridge system that extends the length of the Atlantic Ocean from the Arctic to the Antarctic. It is seismically and (in places) volcanically active; the islands of Iceland, the Azores, Ascension, St. Helena, and Tristan da Cunha are located on it.
  3. 4. is an island of volcanic origin. The term can be used to distinguish such islands from low islands, which are formed from sedimentation or the uplifting of coral reefs
  4. 7. This great mountain system of southern Asia stretches for about 1,550 miles (2,500 kilometers) from west to east.
  5. 8. One of the biggest crash scenes on Earth, a subduction zone is a spot where two of the planet's tectonic plates collide and one dives, or subducts, beneath the other, according to the National Oceanic and Atmospheric Administration (NOAA). This tectonic process can produce some of the planet’s most powerful earthquakes, tsunamis and volcanoes.
  6. 10. a fault line that extends for about 600 miles (965 km) through the length of coastal California. Seismic activity is common along its course, caused by friction between two crustal plates sliding past each other along the line of the fault.
  7. 11. the formation of fresh areas of oceanic crust which occurs through the upwelling of magma at mid-ocean ridges and its subsequent outward movement on either side.
  8. 13. the relatively thin part of the earth's crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.
  9. 15. a current in a fluid that results from convection
  10. 16. tending to move apart in different directions divergent oblique - slanting or inclined in direction or course or position--neither parallel nor perpendicular nor right-angled
  11. 17. a number of volcanoes in a volcanic arc in western North America, extending from southwestern British Columbia through Washington and Oregon to Northern California , a distance of well over 700 miles
  12. 20. linear feature that exists between two tectonic plates that are moving away from each other. Divergent boundaries within continents initially produce rifts, which eventually become rift valleys.